// editor5#include<stdio.h>
#include<stdlib.h>
typedef struct node{
    int data;
    struct node*left,*right;
}Node;
Node*root=NULL;
Node*create(int num){
    Node*newNode=(Node*)malloc(sizeof(Node));
    newNode->data=num;
    newNode->left=NULL;
    newNode->right=NULL;
    return newNode;
}
Node*insert(Node *root,int num){
    if(root==NULL){
        return create(num);
    }
    if(num<root->data){
        root->left=insert(root->left,num);
    }
    else if(num>root->data){
        root->right=insert(root->right,num);
    }
    return root;
}
void inOrder(Node*root){
    if(root!=NULL){
        inOrder(root->left);
        printf("%d ",root->data);
        inOrder(root->right);
    }
}
Node*search(Node*root,int num){
    if(root==NULL || root->data==num){
        return root;
    }
    if(num<root->data){
        return search(root->left,num);
    }
    return search(root->right,num);
}
int main(){
    int size,itr,num;
    scanf("%d",&size);
    if(size<0){
        printf("Invalid input");
        return 0;
    }
    for(itr=1;itr<=size;itr++){
        scanf("%d",&num);
        root=insert(root,num);
    }
    scanf("%d",&num);
    Node*ans=search(root,num);
    if(ans!=NULL){
        printf("Found");
    }
    else{
        printf("Not found");
    }
    return 0;
}