#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>

int main(){
    int n;
    int ans;
    std::cin >> n;
    std::vector<int> v(n);
    for (int i=0;i<n;i++) {
        std::cin >> v[i];
        ans=(v[i]>ans)?v[i]:ans;
        v[i]=v[i]/2;
    }
    ans=ans/2+ans%2;
    std::cout << (ans+std::accumulate(v.begin(),v.end(),0)) << std::endl;
}