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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.Scanner;
public class Main {
	public static Scanner sc = new Scanner(System.in);
    public void run() throws Exception {

    	int N = sc.nextInt();
    	int anw = 100000;
    	for(int i=2; i<N; i++){
    		for(int j=2; j<N; j++){
    			if(i+j == N){
        			int num1 = findSumOfDigits(i);
        			int num2 = findSumOfDigits(j);
        			int an = num1 + num2;
        			anw = Math.min(an,anw);

    			}
    		}

    	}
    	System.out.println(anw);

    }
    public static void main(String[] args) throws Exception {
        new Main().run();
    }

    int findSumOfDigits(int n) {
    	  int sum = 0;
    	  while (n > 0) { // n が 0 になるまで
    	    sum += n % 10;
    	    n /= 10;
    	  }
    	  return sum;
    	}
}