#include <iostream>
using namespace std;
const int MAX_SIZE = 10;
int main() {
int n, v[MAX_SIZE + 1];
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> v[i];
}
int primaPozitie = -1;
for (int i = 1; i <= n; ++i) {
if (v[i] % 2 == 0 && primaPozitie == -1) {
primaPozitie = i;
}}
cout << primaPozitie;
return 0;
}
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