#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;


long long A[1000000] = {0};

int main() {
    
    long long X;
    cin >> X;
    
    for ( long long i = 2; i*i <= X; i++ ) {
        
        int j = 0;
        while ( X%i == 0 ) {
            X /= i;
            j++;
        }
        A[i] = j;
        
        if ( X == 1 ) { break; }
    }
    if ( X != 1 ) { cout << X << endl; return 0; }
    
    long long ans = 1;
    for ( long long i = 2; i <= 1000000; i++ ) {
        if ( A[i]%2 ) { ans *= i; }
    } 
    cout << ans << endl;
    
    
    return 0;
}