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

int main (void)
{
    int h1, m1, h2, m2, k;

    scanf("%d %d %d %d %d", &h1, &m1, &h2, &m2, &k);

    printf("%d", ((h2 * 60 + m2) - (h1 * 60 + m1) - k));

    return 0;
}
