#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);
for(int i=0;i<n;i++)
{
    if(arr[i]==key){
        printf("Elements found at index%d\n",i);
        found=1;
        break;
    }
}
else
{
    printf("not found");
}
printf("\n");
return 0;
}