Problem:
Score : 200 points

Problem Statement

A shop sells N kinds of fruits, Fruit 1, \ldots, N, at prices of p_1, \ldots, p_N yen per item, respectively. (Yen is the currency of Japan.)

Here, we will choose K kinds of fruits and buy one of each chosen kind. Find the minimum possible total price of those fruits.

Constraints

1 \leq K \leq N \leq 1000

1 \leq p_i \leq 1000

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N K
p_1 p_2 \ldots p_N

Output

Print an integer representing the minimum possible total price of fruits.

Sample Input 1

5 3
50 100 80 120 80

Sample Output 1

210

This shop sells Fruit 1, 2, 3, 4, and 5 for 50 yen, 100 yen, 80 yen, 120 yen, and 80 yen, respectively.

The minimum total price for three kinds of fruits is 50 + 80 + 80 = 210 yen when choosing Fruit 1, 3, and 5.

Sample Input 2

1 1
1000

Sample Output 2

1000

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections.Generic;

class Program
{
    public static void Main(string[] args)
    {
        Program pg = new Program();
        pg.Exe();
    }

    public void Exe()
    {
        int[] i_ary = Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);
        int num = i_ary[0];
        int buy = i_ary[1];

        List<int> item_list = new List<int>(Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse));
        item_list.Sort((a, b) => a - b);

        int sum = 0;
        for(int i = 0; i < buy; i++)
        {
            sum += item_list[i];
        }

        Console.WriteLine(sum);
    }
}