import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    n = int(input())
    i = 2
    a = 1
    while i*i <= n:
        while n % (i*i) == 0:
            n //= i*i
            a *= i
        i += 1
    print(n)


if __name__ == '__main__':
    main()