#include <stdio.h>

void main(void) {
	int a,b,c,d = 0;
	scanf("%d %d %d %d",&a,&b,&c,&d);
	int count = 0;
	while(c >= a && d >= b){
		c = c-a;
		d = d-b;
		count++;
	}
	printf("%d",count);
}