package main

import "fmt"

func main() {
	var a, b, c, d, max int
	fmt.Scan(&a, &b, &c, &d)
	max = a
	if max > b/c {
		max = b / c
	}
	if max > d/(1+c) {
		max = d / (1 + c)
	}
	fmt.Println(max)
}