import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int K = sc.nextInt();
        int ans=divid(N);
        System.out.println(ans);
    }
    static int divid(int x){
        if(x%2==0){
            return x/2;
        }else{
            int z=1;
            int rt=(int)Math.sqrt(x);
            for(int i=3;i<=rt; i+=2){
                if(x%i==0){
                    z=x/i;
                    break;
                }
            }
            return z;
        }
    }
}