#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    int n, half, votes, q[101];
    cin >> n;
    half = (n/2) + 1;
    for (int i=0; i < n;i++)
        cin >> q[i];

    sort(q,q+n);

    for (int i =0;i<half;i++)
        votes += (q[i]/2) + 1;


    cout << votes;
    return 0;
}