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

 
#define ll long long
#define ve vector
#define fi first
#define se second
#define pb push_back
#define all(x) begin(x), end(x)
 
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

void solve(){
    int x, d, h, m;
    cin >> x >> d >> h >> m;
    if(x == 5){
        if(d == 29 && h > 2){
            cout << (24-h)*60-m << "\n";
            return;
        }
        else if(d == 29){
            cout << (23-h)*60-m << "\n";
            return;
        }
        cout << 23*60 + (28-d)*24*60 + (24-h)*60 - m << "\n";
        return;
    }
    cout << (23+x-d)*24*60 + (24-h)*60 - m << "\n";
    
}
 
signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    int T = 1;
    // cin >> T;
    while(T--) solve();
}