import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		double num=Double.parseDouble(br.readLine());
		br.close();

		long y=1;

		int i;

		for(i=2;i*i<=num;i++){
			int tmp=0;

			while(num%i==0){
				num/=i;
				tmp++;
			}

			if(tmp%2!=0){
				y*=i;
			}
		}
		if(num>1){
			y*=num;
		}
		System.out.println(y);
	}
}