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

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    long long x,d,h,m; cin>>x>>d>>h>>m;
    long long mini=60*(24-h)-m;
    if(d-x==22 || d==28)
        mini+=60*24;
    if(x==5 && d==27)
        mini+=60*24;
    if(x==5 && (d<29 || h<2))
        mini-=60;
    cout<<mini;
}