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 Java (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.io.*;
import java.util.*;

class Main {
    BufferedReader bf;
    PrintWriter writer;
    StringBuilder sb;
    static boolean local_system = false;

    void run() throws IOException {
        int[] c = ints();
        int[] d = ints();
        Arrays.sort(d);
        int sum = 0;
        for(int i = 0,h=c[1];i<h;i++) sum+=d[i];
        writer.println(sum);
    }

    public static void main(String[] args) throws IOException {
        long start_time = System.currentTimeMillis();
        Main obj = new Main();
        obj.run();
        long end_time = System.currentTimeMillis();
        if (local_system) obj.writer.println("Time : " + (end_time - start_time));
        obj.close();
    }

    public Main(){
        writer = new PrintWriter(System.out);
        bf = new BufferedReader(new InputStreamReader(System.in));
        sb = new StringBuilder();
    }

    public int getInt() throws IOException {
        return Integer.parseInt(bf.readLine());
    }

    public long getLong() throws IOException {
        return Long.parseLong(bf.readLine());
    }

    public int[] ints() throws IOException {
        String[] data = bf.readLine().split(" ");
        int[] send = new int[data.length];
        for (int i = 0, h = data.length; i < h; i++) send[i] = Integer.parseInt(data[i]);
        return send;
    }

    public long[] longs() throws IOException {
        String[] data = bf.readLine().split(" ");
        long[] send = new long[data.length];
        for (int i = 0, h = data.length; i < h; i++) send[i] = Long.parseLong(data[i]);
        return send;
    }

    public void close() throws IOException{
        writer.flush();
        writer.close();
        bf.close();
    }
}