import numpy as np
N = int(input())
M = int(input())
S = [int(input(),2) for m in range(M)]
ambient = (2**N)-1
power = 1
for n in range(N):
	cap = ambient
	cup = power
	for s in S:
		if( ( s >> n ) & 1 == 1 ):
			cap &= s
		else:
			cup |= s
	if( ( ( ~cup ) & cap ) != 0 ):
		print( "No" )
		exit(0)
	power <<= 1
print( "Yes" )