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())
ans=0
a=[9,99,999,9999,99999,999999,9999999,99999999,999999999,9999999999]
for i in range(len(str(n))-1):
    ans+=(a[i]-sum(a[:i]))*(i+1)
ans+=(1+n-int(str(1)+str(0)*(len(str(n))-1)))*len(str(n))
print(ans)
    