import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int n = koko.nextInt();
        int k = koko.nextInt();
        int ans=0;
        for(int i=1; i<n; i++){
            if(n%i==0){
                ans=i;
            }
        }
        System.out.println(ans);
    }
}