from collections import Counter
from sys import stdin

def main():
    X = int(input())

    factors = prime_factors(X)
    num = Counter(factors)
    y = 1
    for i, j in num.items():
        if j % 2:
            y *= i
    print(y)

def prime_factors(n):
    i = 2
    factors = []
    while i * i <= n:
        if n % i:
            i += 1
        else:
            n //= i
            factors.append(i)
    if n > 1:
        factors.append(n)
    return factors

input = lambda: stdin.readline()
main()