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

public class Solution {

    static int howManyGames(int p, int d, int m, int s) {
       int count =0;
         s-=p;
            if(s>=0)
            {
                count++;
                
            }
        while(s>=0)
        {
            p=p-d;
            if(p>=m)
            { 
                s-=p;
            if(s>=0)
            {
                count++;
            }
            }
            else
            { s-=m;
              if(s>=0)
            count ++;
            }
        }
        return count;
    }

    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();
        int answer = howManyGames(p, d, m, s);
        System.out.println(answer);
        in.close();
    }
}