# -*- coding: utf-8 -*-
"""
No.300 平方数
https://yukicoder.me/problems/no/300

"""
import sys
from sys import stdin
from collections import Counter
input = stdin.readline


def calc_divisors(N):
    divisors = []
    for i in range(2, int(N**0.5)+1):
        while N % i == 0:
            divisors.append(i)
            N //= i
    if N != 1:
        divisors.append(N)

    return divisors


def solve(X):
    divisors = calc_divisors(X)
    ans = 1
    for v, fre in Counter(divisors).most_common():
        if fre % 2 == 1:
            ans *= v
    return ans


def main(args):
    X = int(input())
    ans = solve(X)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])