coderforce 588B Duff in Love

#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
#define LL long long
int main()
{
    LL n;
    while(scanf("%lld",&n)!=EOF)
    {
        for(LL i=2;i*i<=n;i++)
        {
            if(n%i)
            {
                continue;
            }
            while((n/i)%i==0)
            {
                n/=i;
            }
        }
        printf("%lld\n",n);
    }
    return 0;
}