import java.io.*;
import java.util.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static boolean isPrime (long n) {
		for (int i = 3; i * i <= n; i += 2) {
			if (n % i == 0) return false;
		}
		return true;
	}
	
	public static long solve (long n) {
		int max = 12 , m = 0;
		long[] p = new long[max];
		int[] cntP = new int[max];
		
		if (n % 2 == 0) {
			long k = n;
			p[m] = 2;
			while (k % 2 == 0) {
				k /= 2;
				cntP[m]++;
			}
			m++;
		}
		
		long q = n;
		for (long i = 3; i * i <= n; i += 2) {
			if (q % i == 0) {
				p[m] = i;
				while (q % i == 0) {
					q /= i;
					cntP[m]++;
				}
				m++;
			}
		}
		
		if (m == 0) return n;
		
		//out(Arrays.toString(p));
		//out(Arrays.toString(cntP));
		
		long ret = 1;
		for (int i = 0; i < m; i++) {
			if (cntP[i] % 2 == 0) continue;
			ret *= p[i];
		}
		
		return ret;
	}
	
	public static void main (String[] args) throws IOException {
		
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		out(solve(Long.parseLong(br.readLine())));
	}
}