/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int Num, counter, i;
		String str1;
		int NumTot = 0;

		str1 = "3124";
		Num = str1.length();

		counter = 0;
	//	i = Integer.parseInt(Character.toString(str1.charAt(0)));


		while (counter < Num)
		{
  			
  			
  			i = Integer.parseInt(Character.toString(str1.charAt(counter)));
  			NumTot = NumTot + i;
  			counter++;
  		}

     

      System.out.println(NumTot);
	}
}