import std.stdio, std.string, std.conv, std.range, std.array, std.algorithm;
import std.uni, std.math, std.container, std.typecons, std.typetuple;
import core.bitop, std.datetime;

void main(){
    int N;
    readVars(N);
    auto x = readln.split.to!(int[]);

    int ans = 0;

    foreach(i ; 0 .. N){
        int tmp = x[i];

        foreach(j ; 0 .. N){
            if(j != i){
                tmp += x[j] / 2;
            }
        }

        ans = max(ans, tmp);
    }

    writeln(ans);
}

void readVars(T...)(auto ref T args){
    auto line = readln.split;
    foreach(ref arg ; args){
        arg = line.front.to!(typeof(arg));
        line.popFront;
    }
    if(!line.empty){
        throw new Exception("args num < input num");
    }
}