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())
d = c = 1
f = 9
res = 0
l = len(str(n))
for i in range(l-1):
    res+=f*c
    f*=10
    d*=10
    c+=1
res+=(n - d + 1)*c
print(res)