#import"bits/stdc++.h"
using namespace std;main(){int n,i,x[100001];cin>>n;memset(x,100001,sizeof(x));for(i=n;i--;)cin>>x[i];sort(x,x+n,greater<int>());for(i=n-1;i>=1;i--)x[0]+=x[i]/2;cout<<x[0]<<endl;}