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#include <bits/stdc++.h>
using namespace std;
int main(){
int n,a,b,c;
cin>>n>>a>>b>>c;
ios_base::sync_with_stdio(0);

if(n<5){
int suma=0;
suma+=60-c;
b++;
suma+=(24-b)*60;
int ile=0;
ile=23+n-a;
if(ile)
suma+=60*24;
cout<<suma;
}
else{
int suma=0;
suma+=60-c;
b++;
if(a==27){
suma+=(24-b)*60;
suma+=24*60;
suma+=23*60;
cout<<suma;
}
if(a==28){
suma+=(24-b)*60;
suma+=23*60;
cout<<suma;
}
if(a==29){
if(b>3)
suma+=(24-b)*60;
else
suma+=(23-b)*60;
cout<<suma;
}
}
}