import java.util.*; public class Main { public static void main(String[] args){ Scanner sc=new Scanner(System.in); int a=sc.nextInt(); int b=sc.nextInt(); int c=sc.nextInt(); int d=sc.nextInt(); int unit=1+c; int vegetable=0; while(d>=unit){ if(a>0 && b>=c){ d-=unit; a--; b-=c; vegetable++; }else{ break; } } System.out.println(vegetable); } }