#include<stdio.h>

int main()
{
	int h1, m1, h2, m2, k;
	int difference = 0;
	scanf("%d%d%d%d%d", &h1, &m1, &h2, &m2, &k);
	difference = ((h2 * 60 + m2) - (h1 * 60 + m1)) - k;
	printf("%d", difference);
	return 0;
}