#include<stdio.h>
int main()
{
	int a;
	scanf("%d", &a);
	a *= 6;
	a /= 10;
	int h, m;
	h = 10 + a / 60;
	m = a % 60;
	printf("%d:", h);
	if (m < 10)
		printf("0%d\n", m);
	else
		printf("%d\n", m);
	return 0;
}