diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..be1d1e8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,8 @@
+### IntelliJ IDEA ###
+.idea
+logs/*
+*.iws
+*.iml
+*.ipr
+
+target/
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..4386776
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>rvc</groupId>
+    <artifactId>time-calc</artifactId>
+    <version>1.0.0</version>
+
+    <name>time-calc</name>
+    <description>time-calc</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+        <maven.compiler.source>8</maven.compiler.source>
+        <maven.compiler.target>8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.6.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <mainClass>rvc.timecalc.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+                <!-- Here come other details
+                ...
+                -->
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git a/src/main/java/rvc/timecalc/Main.java b/src/main/java/rvc/timecalc/Main.java
index fffa07a..853cca4 100644
--- a/src/main/java/rvc/timecalc/Main.java
+++ b/src/main/java/rvc/timecalc/Main.java
@@ -1,6 +1,119 @@
-package rvc.timecalc;/**
+package rvc.timecalc;
+
+import java.io.IOException;
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.HashSet;
+import java.util.Scanner;
+import java.util.Set;
+
+/**
  * @author Robert
  * @since 31.01.2024
  */
 public class Main {
+    public static void main(String[] args) {
+        while(true) {run(args);
+            System.out.println(("Do you want to continue (y/n)?"));
+            Scanner scanner = new Scanner(System.in);
+            if(!scanner.nextLine().equals("y")) {
+                System.out.println("Exiting \"Time Calc\".");
+                break;
+            }
+        }
+
+    }
+        public static void run(String[] args) {
+        System.out.println("*** Time Calc ***");
+        System.out.println("-----------------\n");
+        int EXPECTED_ARG_COUNT = 2;
+        if (args.length == 0) {
+            Scanner scanner = new Scanner(System.in);
+            args = new String[2];
+            System.out.print("Arguments: ");
+            String returned = scanner.nextLine();
+            args[0] = returned.split(" ")[0];
+            if (returned.contains(" ")) {
+                args[1] = returned.split(" ")[1];
+            } else {
+                args[1] = "0:00";
+            }
+        }
+        if (args.length < EXPECTED_ARG_COUNT) {
+            throw new RuntimeException(
+                    "Expected arg count is " + EXPECTED_ARG_COUNT
+                    + ", but count of found args is: " + args.length);
+        }
+        String startTime = args[0];
+        String overtimeUsed = args[1];
+        int startHour = Integer.valueOf(startTime.split(":")[0]);
+        int startMinute = Integer.valueOf(startTime.split(":")[1]);
+        //        System.out.println("startHour=" + startHour);
+        //        System.out.println("startMinute=" + startMinute);
+        int overtimeUsedHour = Integer.valueOf(overtimeUsed.split(":")[0]);
+        int overtimeUsedMinute = Integer.valueOf(overtimeUsed.split(":")[1]);
+        //        System.out.println("overtimeUsedHour=" + overtimeUsedHour);
+        //        System.out.println("overtimeUsedMinute=" + overtimeUsedMinute);
+
+        int endHour = startHour + 8 - overtimeUsedHour;
+        int endMinute = startMinute + 30 - overtimeUsedMinute;
+        while (endMinute >= 60) {
+            endMinute = endMinute - 60;
+            endHour = endHour + 1;
+        }
+        int totalMinutes = (endHour * 60 + endMinute) - (startHour * 60 + startMinute);
+//        System.out.println("totalMinutes=" + totalMinutes);
+        //        System.out.println("endHour=" + endHour);
+        //        System.out.println("endMinute=" + endMinute);
+        System.out.println();
+        DateTimeFormatter dtf = DateTimeFormatter.ofPattern("HH:mm");
+
+        Set<String> alreadyShownTimes = new HashSet<>();
+        NumberFormat formatter = new DecimalFormat("#0.00");
+
+        while (true) {
+            LocalDateTime now = LocalDateTime.now();
+            String nowString = dtf.format(now);
+            if (alreadyShownTimes.contains(nowString)) {
+                //nothing to do
+                continue;
+            } else {
+                alreadyShownTimes.add(nowString);
+            }
+            int hourNow = Integer.parseInt(nowString.split(":")[0]);
+            int minuteNow = Integer.parseInt(nowString.split(":")[1]);
+
+            //            System.out.println("hourNow=" + hourNow);
+            //            System.out.println("minuteNow=" + minuteNow);
+            int hourRemains = endHour - hourNow;
+            int minuteRemains = endMinute - minuteNow;
+            if (minuteRemains < 0) {
+                minuteRemains = minuteRemains + 60;
+                hourRemains = hourRemains - 1;
+            }
+            int hourDone = 8 - overtimeUsedHour - hourRemains;
+            int minutesDone = 30 - overtimeUsedMinute - minuteRemains;
+            int totalMinutesDone = hourDone * 60 + minutesDone;
+            double done = ((double)totalMinutesDone)/((double)totalMinutes);
+//            System.out.println("hourDone=" + hourDone);
+//            System.out.println("minutesDone=" + minutesDone);
+//            System.out.println("totalMinutesDone=" + totalMinutesDone);
+            System.out.println("Progress: " + formatter.format(done * 100) + "% Remains " + String.format("%02d", hourRemains) + ":" + String
+                    .format("%02d", minuteRemains) + " until end " + String
+                                       .format("%02d", endHour) + ":" + String
+                                       .format("%02d", endMinute));
+            if(minuteRemains <= 0) {
+                break;
+            }
+
+            try {
+                Thread.sleep(5000);
+            } catch (InterruptedException e) {
+
+            }
+        }
+    }
 }
+