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.
# 552B
n = int(input())
d = 0
while n/10**d > 1:
    d += 1
cif = 0
for j in range(1,d):
    cif += j*9*10**(j-1)
cif += d*(n-10**(d-1)+1)
print(cif)