package ExcersiseProverki;

import java.util.Scanner;

public class SumSeconds {
public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

int Player1 = Integer.parseInt(scanner.nextLine());
int Player2 = Integer.parseInt(scanner.nextLine());
int Player3 = Integer.parseInt(scanner.nextLine());

int Sum = Player1 + Player2 + Player3;

int minutes = Sum / 60;
int seconds = Sum % 60;

if (seconds < 10) {
System.out.printf("%d:0%d,", minutes , seconds );
} else {
System.out.printf("%d:%d", minutes , seconds );
}
}
}