#include <iostream>
#include <queue>
#include <algorithm>
using namespace std;

int main()
{
    int n;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int x;
    cin >> x;
    int L = 0;
    int R = n - 1;
    while(L <= R) {
        int middle = (L + R) / 2;
        if(a[middle] < x) {
            L = middle + 1;
        }
        else if(a[middle] > x) {
            R = middle - 1;
        }
        else if(a[middle] == x) {
            cout << "Ovoj broj postoi vo nizata" << endl;
            return 0;
        }

    }
    cout << "Ne postoi" << endl;
    return 0;
}