#include <iostream>
using namespace std;
int main(){
    int N;
    cin>>N;
    int factor=1;
    int count=0;
    while(N/factor!=0){
        int highNum=N/(factor*10);
        int curNum=(N/factor)%10;
        int lowNum=N-(N/factor)*factor;
        switch(curNum){
            case 0:
                count+=highNum*factor;
                break;
            case 1:
                count+=highNum*factor+lowNum+1;
                break;
            default:
                count+=(highNum+1)*factor;
        }
        factor*=10;
    }
    cout<<count<<endl;
    return 0;
}