Problem:
Score : 200 points

Problem Statement

Takahashi has two positive integers A and B.

It is known that A plus B equals N.
Find the minimum possible value of "the sum of the digits of A" plus "the sum of the digits of B" (in base 10).

Constraints

2 ≤ N ≤ 10^5

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the minimum possible value of "the sum of the digits of A" plus "the sum of the digits of B".

Sample Input 1

15

Sample Output 1

6

When A=2 and B=13, the sums of their digits are 2 and 4, which minimizes the value in question.

Sample Input 2

100000

Sample Output 2

10

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;

public class Main{
  public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    int min=100001;
    for(int i=1; i<N; i++){
      
      int sum=0;
      int A = i;
      while(A>0){
        sum += A % 10;
        A = A / 10;
      }
      
      int B = N - i;
      while(B>0){
        sum += B % 10;
        B = B / 10;
      }
      min = Math.min(min,sum);
    }
    
    System.out.println(min);
  }
}