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())
num_digits = 0
l = 1
pow10 = 10
while n >= pow10:   
    num_digits += (l * 9 * (pow10 // 10))
    pow10 *= 10
    l += 1    
## n < pow10
num_digits += l * (n - pow10 // 10 + 1)
print(str(num_digits)) 