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.


import bisect

    
b = []
a = []
b.append(0)

for i in range(1, 15):
	b.append(9 * i * (10 ** (i - 1)))


a.append(b[0])
for i in range(1, 15):
	a.append(a[i - 1] + b[i])

n = int(input())


digits = 0

copy = n

while(copy > 0):
	copy //= 10
	digits += 1
	

till = digits - 1;
chars = 0
chars += b[till]

left = (n - (10 ** till) + 1) * digits
chars += left
print(chars)













