#include<bits/stdc++.h>
using namespace std;
int sum1,sum2;
int main(){
    string s;
    cin>>s;
    int len=s.length();
    for(int i=0;i<len;i++){
        sum1+=s[i]-'0';
    }
    sum2=s[i]-'0'+(len-1)*9;
    if(sum1>sum2) cout<<sum1;
    else cout<<sum2;
    cout<<endl;
    return 0;
}

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