#include <iostream>

using namespace std;
void s(int n, int c, int &k)
{
   k=0;
   while(n)
   {
       if(n%10>=c-1 && n%10<=c+1)
        k++;
       n=n/10;
   }
}
int main()
{
    int n=650, c=3, k;
    s(n,c,k);
    cout<<k;
}