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.
r = [1,11,192,2893,38894,488895,588896,6888897,7888898,88888899]

n = input()

a = len(n)
som = 0
c = 1
for i in n:
    som+= int(i)*c*r[a-1]
    a-=1
    c+=1
print(som)
