#include <stdio.h>

int main() {
     int n,key;
     int found=0;
     scanf("%d",&n);
     int arr[n];
     for(int i=0;i<n;i++){
         scanf("%d",&arr[i]);
     }
     int key;
     scanf("%d",&key);
     for(int i=0;i<n;i++){
         if(arr[i]==key){
             printf("Element found at index %d\n",i);
             found =1;
             break;
         }
     }
     if(!found)
     printf("Element not found\n");
return 0;
}