1
n, m = map(int, input().split())
2
table = [input() for i in range(n)]
3
 
4
ans = 0
5
 
6
for i in range(n):
7
    ok = False
8
    for j in range(m):
9
        check = True
10
        for k in range(n):
11
            if k != i and table[i][j] < table[k][j]:
12
                check = False
13
                break
14
        if check == True:
15
            ok = True
16
            break
17
    if ok == True:
18
        ans += 1
19
        
20
print(ans)