#include <bits/stdc++.h>

using namespace std;

int howManyGames(int p, int d, int m, int s) {
    int ans=0;
    int cost=p;
    while(s>=0)
    {
        if(ans==0)
        {
            //ans++;
            s-=cost;
            if(s>=0)
                ans++;
            cost-=d;
        }
        else if(cost>=m)
        {
            //ans++;
            s-=cost;
            if(s>=0)
                ans++;
            
            cost-=d;
        }
        else
        {
           // cost-=m;
            s-=m;
            if(s>=0)
            ans++;
        }
   //     cout << cost << "  " << s << "\n";
    }
    return ans;
}

int main() {
    int p;
    int d;
    int m;
    int s;
    cin >> p >> d >> m >> s;
    int answer = howManyGames(p, d, m, s);
    cout << answer << endl;
    return 0;
}