/* -*- coding: utf-8 -*-
 *
 * 2850.cc:  No.2850 Make Slimes - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

const int INF = 1 << 30;

/* main */

int main() {
  int a, b, c, d;
  scanf("%d%d%d%d", &a, &b, &c, &d);

  int e = (a > 0) ? c / a : INF;
  int f = (b > 0) ? d / b : INF;
  printf("%d\n", min(e, f));
  
  return 0;
}