DayoftheProgrammer.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

public class DayoftheProgrammer {
//	https://www.hackerrank.com/challenges/day-of-the-programmer/problem
    // Complete the dayOfProgrammer function below.
    static String dayOfProgrammer(int year) {
        if(year<1918) {
            if(year%4 == 0)
                return "12.09."+year;
            else
                return "13.09."+year;
        }else if(year == 1918){
            return "26.09.1918";
        }else {
            if(year%400 == 0)  
                return "12.09."+year;
            else if(year%4 == 0 && year%100 != 0)
                return "12.09."+year;
            else
                return "13.09."+year;
        }

    }

    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int year = Integer.parseInt(bufferedReader.readLine().trim());

        String result = dayOfProgrammer(year);

        bufferedWriter.write(result);
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}