// yukicoder 300 (http://yukicoder.me/problems/817)
#include<iostream>
#include<map>
#define itr(it,a) for(auto it=(a).begin();it!=(a).end();++it)

typedef long long ll;

ll X;

std::map<int, int> prime_factor( ll n )
{
	std::map<int, int> ret;

	for( ll i = 2; i*i <= n; ++i ) while( n % i == 0 )
	{
		n /= i;
		++ret[i];
	}

	if( n != 1 )
		++ret[n];

	return ret;
}

int main()
{
	std::cin >> X;

	auto m = prime_factor( X );

	ll Y = 1;
	itr( it, m ) if( it->second&1 )
		Y *= it->first;

	std::cout << Y << std::endl;

	return 0;
}