#define _USE_MATH_DEFINES
 
#include <iostream>
#include <iomanip>
#include <sstream>
 
#include <algorithm>
#include <cmath>
 
#include <string>
#include <queue>
#include <vector>
#include <complex>
#include <set>
#include <map>
#include <stack>
#include <list>

#include <valarray>

#include<cassert>//assert();
//#include <random>//xAOJ
/////////
#define REP(i, x, n) for(int i = x; i < n; i++)
#define rep(i,n) REP(i,0,n)
#define P(p) cout<<(p)<<endl;
 
#define PII pair<int,int>
/////////
typedef long long LL;
typedef long double LD;
typedef unsigned long long ULL;
/////////
using namespace::std;
/////////
/////////

void solve(){
	LL X;
	cin >> X;
	int count = 0;
	int ret = 1;
	bool flag = false;
	for(int i=2;X!=1 && i<=1000000;++i){
		count = 0;
		while( X % i == 0 ){
			X = X/i;
			++count;
		}
		if( count ){
			flag = true;
		}
		if( count % 2 != 0){
			ret *= i;
		}
	}
	if( flag ){
		cout << ret << endl;
	}else{//Xが素数
		cout << X << endl;
	}
}
int main(void){
    std::cin.tie(0); 
    std::ios::sync_with_stdio(false);
    std::cout << std::fixed;//
    cout << setprecision(16);//
	
	//cpp
	solve();
	return 0;
}