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#include <bits/stdc++.h>

using namespace std;
#define pb push_back
#define st first
#define nd second
typedef long long ll;
typedef long double ld;
const ll I = 1'000'000'000'000'000'000LL;
const int II = 2'000'000'000;
const ll M = 1'000'000'007LL;
const int N = 1'000'007;
int tab[N];

void Solve()
{
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    d -= 23;
    int a = d * 24 * 60 + h * 60 + m;
    if(d == 6 && h >= 3) a -= 60;
    int t = (x + 1) * 24 * 60;
    if(x == 5)
        t += 23 * 60;
    cout << t - a << "\n";
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    //int t; cin >> t;
    //while(t--)
        Solve();

    return 0;
}