範例程式碼 uva11677

//uva11677
#include <iostream>
using namespace std;

int main(){
	int a, b, c, d;
	while((cin >> a >> b >> c >> d)){
		if(a == b && b == c && c == d && d == 0)
			break;
		else if(a > c || (a == c && b > d))
			cout << 1440 - ((60 * a + b) - (60 * c + d)) << endl;
		else
			cout << (60 * c + d) - (60 * a + b) << endl;
	}
	return 0;
}