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.
v1=int(input());w=len(str(v1));w1='1'+'0'*w;w2=w*(v1+1);c=0
for i in range(1,w):
    c+=10**i
print(w2-(c+1))