N, M = map(int, input().split())
S = [int(input(), 2) for _ in range(M)]

bit = (1<<N)-1
for s in S:
    bit &= s

if bit != 0 and bit in S and M == 1<<sum((bit>>i & 1) == 0 for i in range(N)):
    print("Yes")
else:
    print("No")