Vanya got an important task — he should enumerate books in the library and label each book with its number. Each of the *n* books should be assigned with a number from 1 to *n*. Naturally, distinct books should be assigned distinct numbers.

Vanya wants to know how many digits he will have to write down as he labels the books.
The first line contains integer *n* (1 ≤ *n* ≤ 10<sup class="upper-index">9</sup>) — the number of books in the library.
n=int(input())
if(n>9):
    p=9
    d=1
    ans=0
    while(p<n):
        ans+=(p*d)
        d+=1
        p=int(pow(10,d))-1
    p=int((p-9)/10)
    ans+=((n-p)*d)
    print(ans)
else:
    print(n)