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

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


def prime_factor(N):
    # 素因数分解
    factors = defaultdict(int)
    for i in range(2, int(N**0.5)+1):
        while N % i == 0:
            factors[i] += 1
            N //= i
    if N != 1:
        factors[N] = 1

    return factors


def solve(X):
    factors = prime_factor(X)
    ans = 1
    for k, v in factors.items():
        if v % 2 == 1:
            ans *= k
    return ans


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


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