#include <bits/stdc++.h>
using namespace std;
int main()
{
int h1,m1,h2,m2,hr,mr,tr;
while(cin>>h1>>m1>>h2>>m2)
{
if(h1==0 && m1==0 && h2==0 && m2==0) break;
hr=h2-h1;
mr=m2-m1;
tr=(hr*60)+mr;
if(tr<0)
{
tr+=24*60;
}
cout<<tr<<endl;
}
return 0;
}
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