import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int i = 2;// 用来除的数，检验n是否为质数
		for(;i<=n;i++) {
			if(n%i==0) break;
		}
		System.out.println(n/i);
		sc.close();
	}
}