#include <bits/stdc++.h> using namespace std; #define repa(i,n) for(it i=0;i<(it)n;i++) #define repb(i,n) for(it i=1;i<=(it)n;i++) #define all(v) v.begin(), v.end() #define rall(v) v.rbegin(), v.rend() #define moda 998244353LL #define modb 1000000007LL #define dai 2500000000000000000LL #define sho -dai #define eps 1e-14 using it=long long; using un=unsigned long long; using db=long double; using st=string; using ch=char; using bo=bool; using P=pair<it,it>; using T=tuple<it,it,it>; using vi=vector<it>; using vd=vector<db>; using vs=vector<st>; using vc=vector<ch>; using vb=vector<bo>; using vp=vector<P>; using sp=set<P>; using ss=set<st>; using si=set<it>; using vvi=vector<vi>; using vvs=vector<vs>; using vvb=vector<vb>; using vvc=vector<vc>; using vvp=vector<vp>; using vsi=vector<si>; using vsp=vector<sp>; using vvsi=vector<vsi>; using vvvi=vector<vvi>; using vvvvi=vector<vvvi>; const it dx[4]={0,1,0,-1}; const it dy[4]={1,0,-1,0}; int main() { st n;cin>>n; cout<<(n.size()+1)*9<<endl; }