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

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	int x, d, h, m, wyn = 0;
	cin>>x>>d>>h>>m;
	if(d - x == 22) wyn += 24 * 60;
	wyn += (23 - h) * 60 + 60 - m;
	if(x == 5) {
		if(d - x <= 23) wyn += 24 * 60;
		if(d < 29 || h < 2) wyn -= 60;
	}
	cout<<wyn;
	return 0;
}