#include <iostream>
#include <algorithm>
using namespace std;

int main(){
  	long X;
  	cin >> X;
  	for(long i = 2; i * i <= X; ){
    	if(X % (i * i) == 0){
        	X /= i * i;
        }else{
        	i++;
        }
    }
  	cout << X << endl;
}