#include <iostream>
using namespace std;

int odl(int d, int h, int m, int a, int b, int c)
{
    int odp=0;
    odp+=(d-a)*24*60;
    odp+=(h-b)*60;
    odp+=m-c;
    return odp;
}

int main()
{
    int x, d, h, m;
    cin>>x>>d>>h>>m;
    if(x==5){
        if(d<29){
            cout<< odl(6,24,0,d-23,h,m)-60;
            return 0;
        }
        if(d==29 && h<2){
            cout<< odl(6,24,0,d-23,h,m)-60;
            return 0;
        }
        cout<< odl(6,24,0,d-23,h,m);
        return 0;
    }
    cout<< odl(x,24,0,d-23,h,m);

}