#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
vector <int> val;
void generate(int n)
{
    int p1, nr, i;
    for(p1=1; p1<100000000; p1*=10)
    {
        nr=n%p1+(n/p1)*p1*10;
        for(i=0;i<=9;i++)
            val.push_back(nr+i*p1);
    }
}
int main()
{
    int i, n, tot=0;
    cin>>n;
    n=n%10000000;
    generate(n);
    sort(val.begin(), val.end());
    for(i=1; i<=val.size(); i++)
        if(val[i]!=val[i-1])
            tot++;
    cout<<tot<<'\n';
    return 0;
}