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.
nstr = input()
n = int(nstr)

#ans = 0
#for i in range(1, len(nstr)+1):
#    if i < len(nstr):
#        ans += 9 * 10**(i-1) * i
#    else:
#        ans += (n - 10**(i-1) + 1) * i

ans = (n+1) * len(nstr)
ans -= int('1'*len(nstr))

print(ans)
