import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static void howManyGames(int p, int d, int m, int s) {
        // Return the number of games you can buy       
        long result =0;
        while (s>0){
            if(p>=m){
                if(s>=p){
                    result++;
                    s-=p;
                    p-=d;

                }else{
                    s-=p;
                }
            }else{
                if(s>=m){
                    s-=m;
                    result++;
                }else{
                    s-=m;
                }
            }
        }
        System.out.println(result);
    
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int p = in.nextInt();
        int d = in.nextInt();
        int m = in.nextInt();
        int s = in.nextInt();
        howManyGames(p, d, m, s);
     
        in.close();
    }
}