#include <iostream>

using namespace std;

int n, x, ma, ans;

int main() {
    scanf("%d", &n);
    for (int i = 1; i <= n; ++i) {
        scanf("%d", &x);
        ma = max(ma, x);
        ans += x / 2;
    }
    ans -= ma / 2;
    ans += ma;
    printf("%d\n", ans);

    return 0;
}