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();
		int sum= 0;
		int []array= new int[n];
		for(int i = 0; i < n; i++){
			sum = 0;
			int number = in.nextInt();
			for(int j = number; j > 0 ;j -=2){
				if(j == 1){
					array[i] = 1;
					break;
				}
				if(j % 2 != 0){
					sum +=j+1;
					array[i] = sum;
					break;
				}
				if(j % 2 == 0){
					sum ++;
				}
				if(j == 2){
					array[i]= sum +(sum * 2)+1;
				}
		}
	}
		int t = 0;
		for(int i = 0 ; i< n; i++){
			t +=array[i];
		}
		System.out.println(t);
    }
}