#include<iostream>
using namespace std;
int main(){
    long long X;
    cin >> X;
    long long ans = 1;
    int count;
    for(long long i=2;i*i<=X;i++){
        count = 0;
        while(X%i == 0){
            count ++;
            X /= i;
        }
        if(count%2 == 1) ans *= i;
    }
    if(X != 1) ans *= X;
    cout << ans << endl;
    return 0;
}