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#include <iostream>

int toOffset(int d, int h, int m) {
    int o = d==30 || (d==29 && h>=3) ? 1 : 0;
    return (d*24+h - o)*60 + m;
}

const int b[]={0, toOffset(25,0,0), toOffset(26,0,0), toOffset(27,0,0), toOffset(28,0,0), toOffset(30,0,0)};

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int x,d,h,m;
    cin >> x >> d >> h >> m;
    cout<<b[x]-toOffset(d,h,m)<<"\n";
    return 0;
}