#include <iostream>
#include <vector>
#include <algorithm>
#define REP(i, a, n) for(ll i = ((ll) a); i < ((ll) n); i++)
#define INF 1000000000LL
#define MOD 1000000007LL
using namespace std;
typedef long long ll;

ll N, X[100000];

int main(void) {
  cin >> N;
  REP(i, 0, N) cin >> X[i];

  sort(X, X + N);

  ll ans = 0;
  REP(i, 0, N - 1) ans += X[i] / 2;
  ans += X[N - 1];
  cout << ans << endl;
}