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 Rust (1.42.0) (judge verdict: Accepted)

fn main(){
  let mut buf = String::new();
  
  std::io::stdin().read_line(&mut buf).expect("failed to read");
  let k: usize = buf.split_whitespace().skip(1).next().unwrap().parse().unwrap();
  
  buf.clear();
  
  std::io::stdin().read_line(&mut buf).expect("failed to read");
  let mut ps: Vec<u32> = buf.split_whitespace().map(|e| e.parse().unwrap()).collect();

  ps.sort();

  let ans: u32 = ps.iter().take(k).sum();
  
  println!("{}", ans);
}