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.
totallis = [9, 90, 900, 9000, 90000, 900000, 9000000, 90000000, 900000000, 9000000000, 90000000000, 900000000000, 9000000000000, 90000000000000]

inp = input()
ghat = len(inp)
intinp = int(inp)

digits = 0

if (ghat > 1):
    for i in range(ghat-1):
        digits += totallis[i]*(i+1)

    rest = (intinp-(10**(i+1)))+1

    digits += rest*(i+2)
else:
    digits = intinp

print(digits)
