n = int(input())
m = int(input())
lis = [[bool(int(c)) for c in input()] for _ in [0] * m]

for i in range(n):
	a = [True] * n
	b = [False] * n
	for bits in lis:
		if(bits[i]):
			for j, f in enumerate(bits):
				a[j] &= f
		else:
			for j, f in enumerate(bits):
				b[j] |= f
	for j in range(n):
		if(i == j):
			continue
		if(a[j] and not(b[j])):
			print("No")
			exit(0)
print("Yes")