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

int startt[5]={23,24,25,26,27};
int endt[5]={24,25,26,27,29};

int main(){
    int x,d,h,m;
    cin>>x>>d>>h>>m;
    x--;

    int ans=0;
    if (x==4){
        if (d==29 && h<2) ans-=60;
        if (d<29) ans-=60;
    }

    while (d!=endt[x] || h!=23 || m!=59){
        ans++;

        m++;
        h+=m/60;
        m%=60;

        d+=h/24;
        h%=24;

        //cout<<d<<" "<<h<<" "<<m<<"\n";
    }

    cout<<ans+1<<"\n";

    return 0;
}