from sys import maxsize as inf
from typing import NamedTuple

class S(NamedTuple):
    b: int
    s: int


def fun(s, t):
    res = inf
    for i in range(2):
        if s[i] == 0:
            continue
        res = min(res, t[i] // s[i])
    return res


a, b, c, d = map(int, input().split())
print(fun(S(a, b), S(c, d)))