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.
'''input
10001
'''
n = int(input())
t, x = 0, 1
while 10**x <= n:
	t += x * (10**x-10**(x-1))
	# print(x, 10**x-10**(x-1))
	x += 1
t += (n - 10**(x-1) + 1) * len(str(n))
print(t)








