while (cin >> n && n >= 0 && n < 20) {
vector arr(n);
for (int i = 0; i < n; ++i) {
cin >> arr[i];
}
int m;
cin >> m;
bool found = false;
for (int i = 0; i < n; ++i) {
if (arr[i] == m) {
cout << i << endl;
found = true;
break;
}
}
#include<bits/stdc++.h>
using namespace std;
int arr[10005];
int main(){
int n;
while (cin >> n && n >= 0 && n < 20) {
vector arr(n);
for (int i = 0; i < n; ++i) {
cin >> arr[i];
}
int m;
cin >> m;
bool found = false;
for (int i = 0; i < n; ++i) {
if (arr[i] == m) {
cout << i << endl;
found = true;
break;
}
}
}
return 0;
}