#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    int p,d,m,s;
    cin>>p>>d>>m>>s;
    int count=0;
    while(s>=0){
        if(p>=m){
            s=s-p;
            if(s>=0)
                count++;
            p=p-d;
        }
        else{            
            s=s-m;
            if(s>=0)
                count++;
        }
    }
    cout<<count;
    return 0;
}