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#include <bits/stdc++.h>

using namespace std;

#define st first
#define nd second
#define pb push_back
#define rep(i,a,b) for(int i = a; i <= b; i++)
#define irep(i,a,b) for(int i = a; i >= b; i--)
typedef long long ll;
typedef long double ld;
//typedef __int128 int128;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int,int> pi; 
typedef pair<double,double> pd;
typedef pair<ll,ll> pl;

int main(){

    ios::sync_with_stdio(0);
    cin.tie(0);

    int x,d,h,m;
    cin >> x >> d >> h >> m;

    int ans = 0;
    if(x <= 4){
        if(d != 23+x) ans += 24*60;
    }
    else{
        if(d != 29) ans += (29-d)*24*60;
        if(d < 29 || (d == 29 && h < 2)) ans -= 60;
    }    
    ans += (24-h-1)*60;
    ans += 60-m;

    cout << ans << '\n';

    return 0;
}

//g++ -O3 -static -Wall .cpp -std=c++17