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.Scanner;
public class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int sum = sc.nextInt();
		int a = 0;
		String b = String.valueOf(sum);
		if(sum%10 == 0){
			a = 10;
		}else{
			String[] c = b.split("",0);
			int[] d = new int[c.length];
			for(int j = 0; j < c.length; j++){
				d[j] = Integer.parseInt(c[j]);
			}
			for(int i = 0; i < d.length; i++){
				a += d[i];
			}
		}
		System.out.println(a);
	}
}