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#include <iostream>
#include <algorithm>
using namespace std ;
typedef long long ll ;
int main() {
    ios::sync_with_stdio(false) ; cout.tie(NULL) ; cin.tie(NULL) ;

    int n , pos = 0 ;
    bool p = false ;
    cin >> n ;
    ll arr[n] , num ;
    for (int i = 0; i < n; i++) cin >> arr[i] ;
    cin >> num ;
    for (int i = 0; i < n; i++) {
        if (arr[i] == num)
            p = true ;
            pos = i ;
            break;
    }
    if (p == true) cout << -1 ;
    else cout << pos ;

    return 0;
}