from collections import defaultdict


def prime_factorize(n):
    V = defaultdict(int)
    i = 2
    while i**2 <= n:
        while n % i == 0:
            V[i] += 1
            n //= i
        i += 1
    if n != 1:
        V[n] += 1
    return V


L, R = map(int, input().split())
base = prime_factorize(L)
base[1] = 1
for key, val in base.items():
    base[key] *= L

for num in range(L + 1, R + 1):
    b = prime_factorize(num)
    for key, val in base.items():
        b[key] *= num
        base[key] = min(base[key], b[key])
ans = 1
for key, val in base.items():
    ans *= key**val
print(ans)