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#include <bits/stdc++.h>

using namespace std;

int poczatek[] = {0, 23, 24, 25, 26, 27};

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int res = 0;
    if(x != 5){
        res = 36 * 60;
    }else{
        res = 59 * 60;
    }

    if(poczatek[x] == d){
        res -= (h-12)*60; //strata od poludnia
        res -= m; 
    }else{
        res -= 12*60; //strata pierwszego dnia
        res -= h*60; //strata od polnocy
        res -= m;
        if(d == 29){
            res -= 24*60; //strata calej doby
        }
    }
    if(d == 29 && h > 2){
        res += 60;
    }
    cout << res << "\n";
    return 0;
}