#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define endl "\n" 
signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n;cin>>n;
    int m = n;
    int x = m%10;
    m/=10;
    int y = m%10;
    m/=10;
    int z = m%10;
    int ans = 19*z;
    if(y<8){
        ans += y;
        if(x>=8)ans++;
    }else{
        if(y==8){
            ans += y;
            ans += x+1;
        }else if(y==9){
            if(x<8)ans += 18;
            else ans += 19;
        }
    }
    if(n>=800)ans++;
    cout<<ans;
    return 0;
}