timus 1025

#include<iostream>
#include<cmath>
#include<string>
#include<vector>
#include<algorithm>
using namespace std;
int a[101];
int main(){
    int n, cnt = 0;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(a, a + n);
    for (int i = 0; i < n / 2 + 1; i++) {
        cnt += a[i] / 2 + 1;
    }
    cout << cnt;
    system("pause");
}