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