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#include "bits/stdc++.h"
using namespace std;
#define rep(i,a,b) for(int i=(a); i<(b); ++i)
#define all(x) x.begin(),x.end()
#define sz(x) int(x.size())
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vvi;

int main(){
    cin.tie(NULL),ios::sync_with_stdio(false);
    
    ll x, d, h, m; cin >> x >> d >> h >> m;

    ll curtime = (d * 24 + h) * 60 + m;
    if (curtime <= (29 * 24 + 2) * 60 and x == 5) curtime += 60;
    ll lasttime = (24 + x + (x==5)) * 24 * 60;

    ll left = lasttime - curtime;

    cout << left << '\n';
}