#include <iostream>
#include <map>
using namespace std;
int main()
{
    long x; cin>>x;
    map<long, int> f;
    for(long i=2;i*i<=x;++i) {
        while (x%i==0) { f[i]++; x/=i; }
    }
    if (x>1) f[x]++;

    long res=1;
    for(auto& v: f) if (v.second&1) res*=v.first;
    cout<<res<<endl;
}