R=range
I=input
N,M=map(int,I().split())
S=[int(I(),2)for i in R(M)]
T=[1]*2**N
A=-1
for s in S:A&=s;T[s]=0
print("YNeos"[A<1 or T[A]or M!=1<<N-sum(A>>i&1for i in R(N))::2])