#include<bits/stdc++.h>
using namespace std;
int main()
{
    int n,left=0,right=0,a=1,now=1,ans=0;
    cin>>n;
    while(n/a)
    {
        left=n/(a*10),now=n/a%10,right=n%a;
        if(now==0) ans+=left*a;
        else if(now==1)ans+=left*a+right+1;
        else ans+=(left+1)*a;
        a=a*10;
    }
    cout<<ans;

    return 0;
}