using System;

namespace No300_1{
    public class Program{
        public static void Main(string[] args){
            long x = long.Parse(Console.ReadLine());
            long tmp = x;
            long result = 1;

            {
                var cnt = 0;
                while(tmp % 2 == 0){
                    tmp /= 2;
                    cnt++;
                }
                if(cnt % 2 == 1){
                    result *= 2;
                }
            }

            for(long i = 3; i * i <= x; i += 2){
                var cnt = 0;
                while(tmp % i == 0) {
                    tmp /= i;
                    cnt++;
                }
                if(cnt % 2 == 1){
                    result *= i;
                }
            }

            if(tmp > 1) result *= tmp;

            Console.WriteLine(result);
        }
    }
}