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#include "bits/stdc++.h"
using namespace std;

int calculate_other(int x, int d, int h, int m) {
    int day = d - 22 - x;

    int result = 0;

    if(day == 0) {
        result += 24 * 60;
    }

    result += 60 - m;
    result += (24-h-1) * 60;

    return result;
}

int calculate_for_5(int x, int d, int h, int m) {
    int day = d - 22 - x;

    int result = 0;

    if(day == 0) {
        result += 24 * 60;
        result += 23 * 60;

        result += 60 - m;
        result += (24-h-1) * 60;
    } else if (day == 1) {
        result += 23 * 60;

        result += 60 - m;
        result += (24-h-1) * 60;
    } else {
        if(h < 2) {
            result += 60 - m;
            result += (23-h-1) * 60;
        } else {
            result += 60 - m;
            result += (24-h-1) * 60;
        }
    }

    return result;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int x, d, h, m;

    cin>>x>>d>>h>>m;
    
    int result;

    if(x < 5) {
        result = calculate_other(x, d, h, m);
    } else {
        result = calculate_for_5(x, d, h, m);
    }

    cout<<result<<'\n';

    return 0;

}