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