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())
# L = []
# cnt  = 0
# for i in range(1,n+1):
#     L.append(str(i))
#     for j in range(0,len(L[i-1])):
#         cnt+=1
#
# # for i in range(0,n):
# #     for j in range(len(L[i])):
# #         cnt+=1
#
# print(cnt)

n = input()
l = len(n)
rez = int(n)*l + l - int('1'*l)

print(rez)