#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
	ll x;	cin>>x;
	map<int,int> ls;
	for(int i=2;i*i<=x;i++){
		while(x%i==0){
			ls[i]++;
			x/=i;
		}
	}
	ls[x]++;
	ll y=1;
	for(auto it=ls.begin();it!=ls.end();it++){
		if(it->second%2==1)	y*=it->first;
	}
	cout<<y<<endl;
	return 0;
}