a1

#include <iostream>

using namespace std;// ||

    int main () {

     int a,b,Sa,Sb,cb,i=0;
     //cout<<"a=";
     cin>>a;//
     b=a;
     while (b!=0)
     {
       Sa=0;
       Sb=0;
         cin>>b;
          //ca=a;
         while (a!=0)
         {
             Sa=Sa+a%10;
             a/=10;
    }
    cb=b;
        while (b!=0)
        {
            Sb=Sb+b%10;
            b/=10;
        }

        if (Sa==Sb)
          i++;

       a=cb;
        b=cb;
     }
cout<<i;
return 0;
    }