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

int main() {
	int x, d, h, m;
	scanf("%d%d%d%d", &x, &d, &h, &m);
	
	int ed = 23+x;
	if (x == 5)
		ed = 29;
	
	int base = (ed-d)*24*60 + (24-h) * 60 - m;
	
	if (x == 5) {
		if (d == 29 && h > 2) {}
		else 
			base -= 60;
	}
	
	printf("%d\n", base);
	
	return 0;
}