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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int x,d,h,m;
    cin>>x>>d>>h>>m;

    int endDay[]={0,24,25,26,27,29};

    auto f=[&](int D,int H,int M){
        return (D-23)*1440+H*60+M;
    };

    int start=f(d,h,m);
    int end=f(endDay[x],23,59);

    int ans=end-start+1;

    int change=f(29,2,0);

    if(x==5 && start<change) ans-=60;

    cout<<ans<<"\n";
}