import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        long[] a = new long[n];
        for(int a_i = 0; a_i < n; a_i++){
            a[a_i] = in.nextLong();
        }
        long result = 0;
        long result1=0;
        for(int a_i = 0; a_i < n; a_i++){
            long s = a[a_i];
        if(a[a_i]%2==0){
            result = a[a_i]/2;
            result1 = result1+result;
        }
            result1 = result1 +s;
        }
        System.out.println(result1+1);
        in.close();
    }
}