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= input()
le = len(n)
ans, l1, p, a = 0, 1, 0, 0
while l1<int(n):
    ans+=((l1-1-p)*a)
    p = l1-1
    l1*=10
    a+=1
l1 = l1//10
ans+=((int(n)-l1+1)*a)
print(ans)
