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#include "bits/stdc++.h"
using namespace std;
using ll = long long;

int x, d, h, m;

int main(){
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> x >> d >> h >> m;
    ll dd = x == 5 ? 29 : x+23;
    ll sm = 1LL*(d-23)*1440+h*60+m;
    ll dm = 1LL*(dd-23+1)*1440;
    ll ch = 1LL*(29-23)*1440+120;
    ll diff = dm - sm;
    if(sm < ch && ch <= dm) diff -= 60;
    cout << diff << '\n';
}