// editor3
#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node *left,*right;
}node;
 node *root=NULL;
 
node *create(char num)
{
    node *newnode=(node*)malloc(sizeof(node));
    newnode->data=num;
    newnode->left=NULL;
    newnode->right=NULL;
    printf("%d",newnode->data);
    return newnode;
}

node *insert(node *root, char num)
{
    if(root==NULL)
    {
        return create(num);
    }
    else if(num<root->data)
    {
        root->left=insert(root->left,num);
    }
    else if(num>root->data)
    {
        root->right=insert(root->right,num);
    }
    return root;
}


int main()
{
    int size;
    int num;
    scanf("%d",&size);
    if(size<0)
    {
        printf("Invalid input");
        return 0;
    }
    for(int i=0;i<=size;i++)
    {
        scanf("%d",&num);
        root=insert(root,num);
    }
  
    return 0;