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.
r = [1,11,192,2893,38894,488895,5888896,68888897,788888898,8888888899]
s = [1,20,300,4000,50000,600000,7000000,80000000,900000000,1000000000]

n = input()
a = len(n)-1

res = r[a]+((int(n[0])-1)*s[a])
t = 10
for i in range(1,len(n)):
    
    kt = int(n[i])
    res+= (kt*(s[a]//t))
    t*=10
    
print(res)


