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.io.*;

 
public class Main {
	  public static void main(String args[])throws IOException
             {
		BufferedReader br =    
		    new BufferedReader(new InputStreamReader(System.in));  
		
		
		    String str1 = br.readLine();
		    int N = Integer.parseInt(str1);
		    
		    if(N%10<= 0)
		    {
		    	System.out.println(10);
		    }
		    else
		    {	
		    	int sum = 0;
		    	
		    do {	sum += N % 10;
		    } while((N/= 10)!= 0);
		    	System.out.println(sum);
		    
		    }
        
		    
        	
             }
}