签到

#include<stdio.h>
#include<math.h>
#include<bits/stdc++.h>
using namespace std;
#define ll long long

int main()
{
	ll n;
	cin>>n;
	ll ans = 1;
	for(int i = 2; i *i <= n; ++ i)
	{
		ll end = 0;
		while(n % i == 0)
		{
			end ++;
			n /= i;
		}
		if(end & 1)ans *= i;
	}
	ans *= n;
	cout<<ans<<endl;
  return 0;
}