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.
import sys
# for _ in range(int(input())):
n = int(input())
# l = [int(x) for x in input().split()]
# s = input()
e,s = 9,1
i = 1
ans = 0
while(s<=n):
    ans+=(min(e,n)-s+1)*i
    s*=10
    e = (e+1)*10-1
    i+=1
print(ans)

