#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<inttypes.h>

typedef int32_t i32;

void run (void) {
  i32 a, b, c, d;
  scanf ("%" SCNi32 "%" SCNi32 "%" SCNi32 "%" SCNi32, &a, &b, &c, &d);
  i32 ans = 0;
  while (ans <= a && c * ans <= b && ans + c * ans <= d) ans++;
  printf("%" PRIi32 "\n",ans - 1);
}

int main (void) {
  run ();
  return 0;
}