#include <iostream> using namespace std; int main() { const int ARRAY_SIZE = 20; int arr[ARRAY_SIZE] = {0}; int size; while (cin >> size) { for (int i = 0; i < size; i++) { cin >> arr[i]; } int find; cin >> find; bool flag = false; for (int i = 0; i < size; i++) { if (arr[i] == find) { flag = true; cout << i << endl; break; } } if (!flag) { cout << "No" << endl; } } return 0; }