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.
# print(9)

# ans = 0;
# for i in range(10,100):
#     x=list(str(i))
#     ans+=len(x);
# print(ans)

# ans = 0;
# for i in range(100,1000):
#     x=list(str(i))
#     ans+=len(x);
# print(ans)

# ans = 0;
# for i in range(1000,10000):
#     x=list(str(i))
#     ans+=len(x);
# print(ans)
    
# ans = 0;
# for i in range(10000,100000):
#     x=list(str(i))
#     ans+=len(x);
# print(ans)
    
# ans = 0;
# for i in range(100000,1000000):
#     x=list(str(i))
#     ans+=len(x);
# print(ans)
# print()
# print()


n=int(input())
if n<=9:
    print(n)
else:
    A=(len(str(n))-1)*9;
    # print(A)
    B=10**(len(str(n))-1-1);
    ans=A*B;
    # print(B)    
    # print(ans)
    N=B*10;
    J=(n-N)+1;
    ans+=(J*len(str(n)))
    print(ans)
    