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 = input()
c = 0
l = len(n)-1

if len(n)>=2:
	for i in range(len(n)-1):
		c+=int("9"+"0"*i)*(i+1)

	c += 1
	k = ((int(n[0]+"0"*l))-(int("1"+"0"*l)))*(l+1)+int(n[1::])*(l+1)+l
	print(c+k)
else:
	print(n)