#include<bits/stdc++.h>

using namespace std;

int time_in_min(int d, int h, int m) {
    return d*24*60 + h*60 + m;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int round_end[6];
    for (int i=1;i<=4;i++) round_end[i] = (23+i);
    round_end[5] = 29;

    int x, d, h, m;
    cin>>x>>d>>h>>m;
    
    int min_left = time_in_min(round_end[x], 23, 59) - time_in_min(d, h, m) + 1;
    
    if(x == 5 && time_in_min(d, h, m) < time_in_min(29, 2, 0)) {
        min_left -= 60;
    }
    
    cout << min_left;

    return 0;
}