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.
s = input()
n = int(s)

# lenght of n
# n >= 10 ** x
x = len(s)

total = 0
for i in range(1, x):
    # there are (10 ** i) - (10 ** (i - 1)) numbers
    # of length (i)
    numbers = (10 ** i) - (10 ** (i - 1))
    total += i * numbers

# print(total)
remaining = n - (10 ** (x - 1)) + 1
total += x * remaining

print(total)

