import sys
input = sys.stdin.readline

def solve():
	n = int(input())
	m = int(input())
	st = set([int(input().rstrip(), 2) for _ in [0] * m])

	MAX_INT = (1 << n) - 1
	for i in range(n):
		a = MAX_INT
		b = 0
		for k in st:
			if((k >> i) & 1):
				a &= k
			else:
				b |= k
		if(a & ~b & (MAX_INT - (1 << i))):
			print("No")
			exit(0)
	print("Yes")

solve()