include
using namespace std;
int main() {
int n, a[101], w, z = 0;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
}
cin >> w;
for (int i = 1; i <= n; i++) {
if (a[i] == w) {
z++;
cout << i;
break;
}
}
if (z == 0) {
cout << "0";
}
return 0;
}