def find_radical(n):
    p = []
    d = 2
    rad = 1
    while d * d <= n:
        cnt = 0
        while n % d == 0:
            cnt += 1
            n //= d
        if cnt != 0:
            rad *= d
        d += 1
    if n > 1:
        rad *= n
    return rad


number = int(input())
radical = find_radical(number)
for i in range(1, 30):
    x = i * radical
    if pow(x, x, number) == 0:
        print(i * radical)
        break