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=int(input())
t=0
a=n
m=0
ab=n
h=1
while 10**h<=n:
    h=h+1
for i in range(1,h):
    ti=10**i-10**(i-1)
    t=t+ti*i1
t=t+(n-10**(h-1)+1)*h
print(t)
