from sys import stdin
import sys, re

vn = stdin.readline()

number = r"[0-9]+"
two_numbers = f"{number} {number}"

# space-separated integers
assert re.match(two_numbers, vn)

v, n = map(int, vn.split())

minv, maxv = 1, 10**5
assert minv <= v <= maxv

minn, maxn = 3, 500
assert minn <= n <= maxn

for _ in range(n):
    xy = stdin.readline()

    assert re.match(two_numbers, xy)

    x, y = map(int, xy.split())

    assert 0 <= x <= 10**5
    assert 0 <= y <= 10**5

assert len(stdin.readline()) == 0

sys.exit(42)