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())
ar = [0 for i in range(11)]
ar[1] = 9
ar[2] = 89
cont = 89
ans = 0
for i in range(3, 11):
    cont = cont*10+9
    ar[i] = cont
for i in range(len(str(n))-1, -1, -1):
    ans+=ar[i]
ans += (n - ar[len(str(n))-1])*len(str(n))
print(ans)
