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

signed main() {
	int N;
	cin >> N;
	vector<int> X(N);
	for (int i = 0; i < N; i++) {
		cin >> X[i];
	}
	int mx = -1;
	int sum = 0;
	for (int i = 0; i < N; i++) {
		sum += X[i] / 2;
		mx = max(mx, X[i]);
	}
	cout << ((sum - (mx / 2)) + mx) << endl;
	return 0;
}