Practice websites

We recommend the following websites for you to get practice and get familiar with the programming contest.

A sample problem

Problem: Given an array of integers, find the sum of its elements.

Input Format
The first line contains an integer, n, denoting the size of the array. 
The second line contains  space-separated integers representing the array's elements.
Constraints: 0 < n and the elements < 1000

Output Format
Print the sum of the array's elements as a single integer.

Sample Input
6
1 2 3 4 10 11

Sample Output
31