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#include <iostream>
using namespace std;

int main() 
{
    int a,b,c,d,h,m;
    cin>>a;
      cin>>b;
      cin>>c;
      cin>>d;
      if(d!=0)
      {
        c++;
        m=60-d;
      }
      h=48-c;
    if(a==5)
    {
      if(b==27)
      {
        h=h+24;
      }
      h--;
    }
    m=m+h*60;
    cout<<m;
    return 0;
}