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())

digits = len(str(n))
#print(digits)
sum = 0


def getnum(n):
    if n == 0:
        return n
    num = 9
    for i in range(1,n):
        num = num * 10
        num = num + 9
    return num
while True:
    num = getnum(digits - 1)
    #print(num, digits)
    sum = sum + (n - num)*digits
    digits = digits - 1
    n = num
    if digits == 0:
        break

print(sum)