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#include<bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    ll x, d, h, m;
    cin >> x >> d >> h >> m;
    
    if (x == 1){
        if (d == 23)
            cout << 60*(24-h) -m +60*24 << '\n';
        else
            cout << 60*(24-h) -m << '\n';
    }
    else if (x == 2){
        if (d == 24)
            cout << 60*(24-h) -m +60*24 << '\n';
        else
            cout << 60*(24-h) -m << '\n';
    }
    else if (x == 3){
        if (d == 25)
            cout << 60*(24-h) -m +60*24 << '\n';
        else
            cout << 60*(24-h) -m << '\n';
    }
    else if (x == 4){
        if (d == 26)
            cout << 60*(24-h) -m +60*24 << '\n';
        else
            cout << 60*(24-h) -m << '\n';
    }
    else{
        if (d == 27)
            cout << 60*(24-h) -m +60*24*2 -60 << '\n';
        else if (d == 28)
            cout << 60*(24-h) -m +60*24 -60 << '\n';
        else if (h < 2)
            cout << 60*(24-h) -m -60 << '\n';
        else
            cout << 60*(24-h) -m << '\n';
    }
    
    return 0;
}