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()
s = len(n)

'''
9 - 1 1 1 1 1 1 1 1 1
90 - 11 11 11 11 11 11 11 11 11 11 ... 11 11 
900 - 111 111 111 111 111 111 111 ... 111 111
9000 - 1111 1111 1111 ... 1111 1111
'''

q = 0

if s > 2:
  for c in range(s-1):
    v = int('9' + c*'0')
    q += v*(c+1)
  k = int(n) - (int('1' + (s-1)*'0') - 1)
  q += k * s
elif s == 2:
  q += 9
  k = int(n) - 9
  q += k * s
else:
  q += s*int(n)

print(q)