import sys
input = sys.stdin.readline

N, K = map(int, input().split())
A = [list(map(int, input().split())) for _ in [0] * N]

if(K == 1):
	print(N - 1)
	exit(0)

local_max = [False] * N
for i in range(K-1):
	for j in range(i+1, K):
		lis = sorted([(A[k][i], A[k][j], k) for k in range(N)], reverse = True)
		ma = lis[0][1]
		local_max[lis[0][2]] = (lis[0][0] > lis[1][0] or lis[0][1] > lis[1][1])
		for a, b, c in lis:
			if(b <= ma):
				continue
			local_max[c] = True
			ma = b
print(N - sum(local_max))