#include <bits/stdc++.h>
using namespace std;
int main(){
int h1;
int m1;
int h2;
int m2;
while(cin>>h1>>m1>>h2>>m2){
if(h1==0){
h1=24;
}
if(h2==0){
h2=24;
}
if((h2>h1) and (h1=h2 and m2>=m1) and (h2<h1)){
cout<<(h2-h1)*60+(m2-m1)<<'\n';
}
if(h2=h1 and m2<m1){
cout<<1440+(m2-m1)<<'\n';
}
}
}
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