UVa 11677 - Alarm Clock

// UVa 11677 - Alarm Clock
#include <iostream>
using namespace std;

int toMinutes(int h, int m) {
	return h * 60 + m;
}

int main() {
	int h1, m1, h2, m2;
	while (cin >> h1 >> m1 >> h2 >> m2 && (h1 || m1 || h2 || m2)) {
		int currentTime = toMinutes(h1, m1);
		int alarmTime = toMinutes(h2, m2);
		if (alarmTime < currentTime)
			alarmTime += 24 * 60;
		cout << alarmTime - currentTime << endl;
	}
	return 0;
}