include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<string.h>
struct Node{
    int data;
    struct Node* next;
};
struct Node* createNode(int data){
    struct Node* newNode=(struct Node*)malloc(sizeof(struct Node));
    newNode->data=data;
    newNode->next=NULL;
    return newNode;
}
void append(struct Node** head,int data){
    struct Node*newNode=createNode(data);
    if(*head==NULL){
        *head=newNode;
        return;
    }
    struct Node*temp=*head;
    while(temp->next!=NULL){
        temp=temp->next;
    }
    temp->next=newNode;
}
int search(struct Node*head,int target){
    struct Node*current=head;
    while(current!=NULL){
        if(current->data==target)
        return 1;
        current=current->next;
    }
    return 0;
}
int main(){
    int n;
    if(scanf("%d",&n)!=1 || n<1 ||n>1000){
        printf("Invalid input\n");
        return 0;
    }
    struct Node*head=NULL;
    for(int i=0;i<n;i++){
        char buffer[50];
        if(scanf("%s",buffer)!=1){
            printf("Invalid input\n");
            return 0;
        }
        for(int k=0;k<strlen(buffer);k++){
            if(!isdigit(buffer[k])&& !(k==0 &&  buffer[k]=='-')){
                printf("Invalid input\n");
                return 0;
            }
        }
        int value=atoi(buffer);
        append(&head,value);
    }
    char targetStr[50];
    if(scanf("%s",targetStr)!=1){
        printf("Invalid input\n");
        return 0;
    }
    for(int k=0;k<strlen(targetStr);k++){
        if(!isdigit(targetStr[k])&& !(k==0 && targetStr[k]=='-')){
            printf("Invalid input\n");
            return 0;
        }
    }
    int target=atoi(targetStr);
    if(search(head,target))
    printf("Found\n");
    else
    printf("Not found\n");
    return 0;
}