import java.io.*
import kotlin.math.*
import java.util.*
import kotlin.system.exitProcess
 
fun main()=with(BufferedReader(InputStreamReader(System.`in`))) {
    var bw = BufferedWriter(OutputStreamWriter(System.out))
    var s = readLine()
    var len = s.length
    var n = s.toInt()
    var res :Long = 0
    while(true){
        res = res + (n-((10.0.pow(len-1)).toInt()-1))*len
        len = len-1
        n = 10.0.pow(len-1).toInt()-1
        if(len==0) break
    }
    bw.write("$res")
    bw.flush()
}

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MTIw

120