#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
using namespace std;

//#include<bits/stdc++.h>

int main() {

	vector<int>a, b;
	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		int x;
		cin >> x;
 b.push_back(x);
	}
	sort(a.begin(), a.end());
	sort(b.begin(), b.end());
	long long int ans = 0;
	for (int i = 0; i < n - 1; i++)ans += b[i] / 2;
	ans += b[n - 1];
	cout << ans<<endl;


	return 0;
}