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#include <bits/stdc++.h>
using namespace std;
const int N = 2000;
/*
4
-1 3 5 3
3
*/
int a[N];
int k, n, x;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
cin >> x;
for (int i = 1; i <= n; i++) {
if (a[i] == x) {
k = i;
printf("%d", k);
break;
}
}
if (k == 0)
printf("-1");
return 0;
}