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: Runtime Error)

using System;
using System.Linq;
using System.Collections.Generic;

namespace B
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] nk = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
            var pSet = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToHashSet();
            int[] ps = pSet.ToArray();
            Array.Sort(ps);
            int sum = 0;
            for(int i = 0; i < nk[1];i++)
            {
                sum += ps[i];
            }
            Console.WriteLine(sum);
        }
    }
}