#include <iostream>
#include<string>
#include<cmath>
#include<algorithm>
#include<cctype>
#include<queue>
#include<deque>
#include<regex>
#include<stack>
#include<stdio.h>
#include<vector>
#include<set>
#include<map>
#include<iomanip>

#define rep(i, n) for(int i=0;i<n;i++)

typedef int long long ll;
using namespace std;
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
const ll MOD = 1e9 + 7;

int main() {

    int a,b,c,d;
    cin>>a>>b>>c>>d;
    int ans;
    for(int i=d;i>=0;i--){
        if(i%(1+c)==0){
            ans=i/(c+1);
            break;
        }
    }
    cout<<ans<<endl;


    return 0;
}