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())
amountOfDigits = len(str(n))
cnt = 0
a = []
for i in range(amountOfDigits) :
    a.append(10 ** i)
for i in range(amountOfDigits - 1, -1, -1) :
    cnt += (n - a[i] + 1) * (len(str(a[i])))
    n = a[i] - 1
print(cnt)