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#include <iostream>
using namespace std;

int main() 
{
    int x,d,h,m;
    cin>>x>>d>>h>>m;
 
 
    int dni = (24+x-1)-d;
    if (x == 5) dni = dni+1;
    int g = dni * 24+(23-h);
    if (x == 5 ) {
      if (d<29) g = g - 1;
      if (d==29 and h<2) g = g - 1;
    }
    int min = 60-m+g*60;
    
    cout<<min;
    return 0;
}