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, x0, y0 = map(int, input().split())
r = 0
q = {}
for i in range(n):
    x, y = map(int, input().split())
    if x != x0:
        t = float(y - y0) / float(x - x0)
        q[t] = 1
    else:
         r = 1
for a in q:
    r += q[a]
print(r)