# Should not work in the time limit.
N, M = list(map(int, input().split()))
inc_dec = []
for _ in range(M):
    inc_dec.append(list(map(int, input().split())))

cum_sum = [[0] * (N+1) for _ in range(M+1)]
for i in range(M):
    for j in range(N):
        cum_sum[i+1][j+1] = cum_sum[i][j+1] + cum_sum[i+1][j] - cum_sum[i][j] + inc_dec[i][j]

for end_y in range(1, M+1):
    for start_x in range(N):
        for end_x in range(start_x+1, N+1):
            if cum_sum[end_y][end_x] - cum_sum[end_y][start_x] == 777:
                print('YES')
                exit()
print('NO')