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#ifdef DEBUG
#define _GLIBCXX_DEBUG
#endif
//#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#else
#define debug(...) 228
#endif


typedef long long ll;
typedef long double ld;

#define pb push_back
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) FOR(i, 0, a)

vector<int> read_vec(int n) {
    vector<int> v(n);
    for (int& t : v) cin >> t;
    return v;
}

template<typename T>
inline void upd_max(T& a, T b) {
    if (a < b) {
        a = b;
    }
}

template<typename T>
inline void upd_min(T& a, T b) {
    if (a > b) {
        a = b;
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#ifdef DEBUG
    freopen("input.txt", "r", stdin);
#endif
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    int we = d * 24 * 60 + h * 60 + m;
    int fin = (x <= 4 ? ((24 + x) * 24 * 60) : (25 + x) * 24 * 60);
    int mins = fin - we;
    if (x == 5 && (d <= 28 || (d == 29 && h <= 1))) mins -= 60;
    cout << mins << '\n';
    return 0;
}