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#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define pll pair<ll,ll>
#define pii pair<int,int>
#define ld long double
using namespace std;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int x,d,h,m;
    int minuty = 0;
    cin >> x >> d >> h >> m;
    if(x < 5){
        if(d < 23 + x){
           d++;
           minuty += 60 * (24 - h) - m;
           h = 0;
           m = 0;
        }
        minuty += 60 * (24 - h) - m;
        cout << minuty;
    }
    else{
        if(d < 29 || (d == 29 && (h < 2 || (h == 2 && m == 0))))minuty -= 60;
        if(d == 27){
            d++;
            minuty += 60 * (24 - h) - m;
            h = 0;
            m = 0;
        }
        if(d == 28){
            d++;
            minuty += 60 * (24 - h) - m;
            h = 0;
            m = 0;
        }
        minuty += 60 * (24 - h) - m;
        cout << minuty;
    }
}