#include <stdio.h>

int main() {
    int n;
    scanf("%d",&n);
    int arr[n];
    for(int i=0;i<n;i++)
    {
        scanf("%d",&arr[i]);
    }
    int key;
    scanf("%d",&key);
    int low=0,high=n-1,found=0;
    while(low<=high){
       
            int mid=(low<=high)/2
            if(arr[mid]==key){
                printf("element found");
                foumd=1;
                break;
            }
            else if(arr[mid]<key){
                low=mid+1;
            }
            else{
                high=mid-1;
            }
            
            }
            if(!found)
            printf("Elemnet not found");
        }
    }
    return 0;
}