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 = input()
if(len(n)==1):
    print(n)
else:
    #c = 0
    #for i in range(10, int(n)+1):
    #    if i%10==0:
    #        st = str(i);
    #        c+=len(st)
    #print(c)

    #n = input()

    pw = 1;
    res = 0;

    for i in range(0, len(n)-1):
        res+=(pow(10, i+1) - pow(10, i))* (i+1)
        #print(pow(10, i+1) - pow(10, i))
    #print(res)

    #fir = int(n[0])
    res+= (int(n) - pow(10, len(n)-1)) * (len(n))
    #print(int(n) - pow(10, len(n)-1) 10)
    print(res+len(n))
    #print('111')
