#include <bits/stdc++.h>

using namespace std;

int howManyGames(int p, int d, int m, int s) {
    
    int sum=0,ctr=0;
    do
    {
        if(p>=m)
        {
            sum+=p;
            p-=d;
            if(sum<=s)
            ctr++;
        }
        else
        {
            sum+=m;
            if(sum<=s)
            ctr++;
        }            
    }while(sum<=s);   
    return ctr;
    // Return the number of games you can buy
}

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;
}