不喜勿喷！

#include <iostream>
#include <cstdio>
using namespace std;
short h1, m1, h2, m2; 
int main()
{
	cin >> h1 >> m1 >> h2 >> m2;
	cout << (h2 - h1) * 60 + (m2 - m1);
	
	return 0;
}

#include <bits/stdc++.h>
using namespace std;

int ans(int a, int b, int c, int d)
{
    return (c - a) * 60 + (d - b);
}

int main()
{
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    cout << ans(a, b, c, d) << endl;
    return 0;
}