include "iostream.h"
#include "conio.h"
#include "stdio.h"
int main()
{
     int a,b=10,c,s=0;
     cin>>a;
     while(a>b)
     {
               c=a%b;
               a=a/b;
               s=s+c;
               }
               s=s+a;
               cout<               cin>>a;
               return 0;
 }