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) { if(s
m) { i=i-d; } else { if(i>=m) { i=m; d=0; } } count++; while(s>=i) { s=s-i; if(i-d>m) { i=i-d; } else { if(i>=m) { i=m; d=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(); } }