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

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    ll i, x;
    cin >> x;
    RREP (i,2,100000) {
        if (x % (i*i) == 0)
            x /= i*i;
    }
    cout << x << endl;
    return 0;
}