#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

int main()
{
	int nidoneCnt = 0;
	int time = 0;
	int minutes = 0;
	int sleepTime = 0;

	scanf("%d", &nidoneCnt);
	scanf("%d", &time);
	scanf("%d", &minutes);
	scanf("%d", &sleepTime);

	sleepTime = (nidoneCnt - 1) * sleepTime;
	minutes += sleepTime;

	while (minutes >= 60)
	{
		minutes -= 60;
		time++;
		if (time > 23)
		{
			time = 0;
		}
	}

	printf("%d", time);
	printf("%d", minutes);
}