#約数
def make_divisors(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]

N,K = map(int, input().split())
D = make_divisors(N)
ans = 1
for k in range(K):
    for d in D[::-1]:
        if d*K<=N:
            ans = max(d,ans)
print(ans)