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#include <bits/stdc++.h>
using namespace std;
int main()
{
int h1,m1,h2,m2;
while(scanf("%d%d%d%d",&h1,&m1,&h2,&m2)==4&&(h1!=0||m1!=0||h2!=0||m2!=0))
{
if(h2==h1 && m2<m1) h2+=24;
else if(h2<h1) h2+=24;
cout<<(h2*60+m2)-(h1*60+m1)<<endl;
}
return 0;
}
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