from functools import reduce
from collections import Counter
N = int(input())

def factors(x):
    f = [1]
    while x % 2 == 0:
        f.append(2)
        x = x // 2
    n=3
    while x >= n * n:
        while x % n == 0:
            f.append(n)
            x = x // n
        n = n + 2
    if x == 1:
        return f
    f.append(x)
    return f

cnt = Counter(factors(N))
ans = reduce(lambda x, y: x * y, [i for i, v in cnt.items() if v%2 != 0])
print(ans)