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 N = sc.nextInt();

        int rem = N % 10;
        int div = N / 10;
        if(rem == 0){
        	if(N >= 100){
        		while(div >= 100){
        			div /= 10;
        		}
        	}else{
        		div = N;
        	}
    		System.out.println(div);
        }else{
        	while(div >= 10){
            	rem += div % 10;
            	div /= 10;
        	}
    		System.out.println(div + rem);
		}
    }
}