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#include <iostream>
#include <vector>

typedef long long ll;
using namespace std;
long long num;

int main()
{
    cin.tie(0);cout.tie(0); ios_base::sync_with_stdio(0);
    
    int x, d, h, m;
    int sum;
    cin >> x >> d >> h >> m;
    sum = 0;
    switch (x)
    {
    case 1:
        if (d == 23) {
            sum = 2*24 * 60;
            sum = sum - (h * 60 + m);
        }
        else {
            sum = 24 * 60 - (h * 60 + m);
        }
        break;
    case 2:
        if (d == 24) {
            sum = 2 * 24 * 60;
            sum = sum - (h * 60 + m);
        }
        else {
            sum = 24 * 60 - (h * 60 + m);
        }
        break;
    case 3:
        if (d == 25) {
            sum = 2 * 24 * 60;
            sum = sum - (h * 60 + m);
        }
        else {
            sum = 24 * 60 - (h * 60 + m);
        }
        break;
    case 4:
        if (d == 26) {
            sum = 2 * 24 * 60;
            sum = sum - (h * 60 + m);
        }
        else {
            sum = 24 * 60 - (h * 60 + m);
        }
        break;
    case 5:
        if (d == 27) {
            sum = 3 * 24 * 60;
            sum = sum - (h * 60 + m) - 60;
        }
        else if (d == 28) {
            sum = 2 * 24 * 60;
            sum = sum - (h * 60 + m) - 60;
        }
        else {//d = 29
            if (h < 2) {
                sum = 1 * 24 * 60;
                sum = sum - (h * 60 + m) - 60;
            }
            else {
                sum = 1 * 24 * 60;
                sum = sum - (h * 60 + m);
            }
        }
        break;
    default:
        break;
    }

    cout << sum << '\n';

    return 0;
}