#include <iostream>
#include <algorithm>
using namespace std;
int main() {
int k, v[101], supporters = 0;
cin >> k;
for (int i = 1; i <= k; i++) {
cin >> v[i];
}
sort(v + 1, v + k + 1);
for (int i = 1; i <= k / 2 + 1; i++) {
supporters += v[i] / 2 + 1;
}
cout << supporters << "\n";
return 0;
}
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