#include <bits/stdc++.h> using namespace std;

int main() { int n,x=0; int a[105]; while (1) { cin>>n; if(n==0) break;

	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	sort(a, a + n);
	int v = n / 2 + 1;
	int x = 0;
	for (int j = 0; j <=n/2; j++) {
		x = x + (a[j] /2+ 1);
	}
	cout << x << endl;
}
return 0;

}