for e in iter(input,'0 0'):

 r=int(e.split()[0])

 d=[int(''.join(x),2)for x in zip(*[input().split()for _ in[0]*r])]

 a=0

 for m in range(1<<~-r):

  t=0

  for s in d:

   c=bin(m^s).count('1')

   t+=c if c>r//2 else r-c

  if a<t:a=t

 print(a)

def v():

 for e in iter(input,'0 0'):

  r=int(e.split()[0])

  d=[int(''.join(x),2)for x in zip(*[input().split()for _ in[0]*r])]

  a=0

  for m in range(1<<~-r):

   t=0

   for s in d:

    c=bin(m^s).count('1')

    t+=c if c>r//2 else r-c

   if a<t:a=t

  print(a)

if'__main__'==__name__:v()

for e in iter(input, "0 0"):
    r = int(e.split()[0])
    d = [int("".join(x), 2) for x in zip(*[input().split() for _ in [0] * r])]
    a = 0
    for m in range(1 << ~-r):
        t = 0
        for s in d:
            c = bin(m ^ s).count("1")
            t += c if c > r // 2 else r - c
        if a < t:
            a = t
    print(a)

def v():
    for e in iter(input, "0 0"):
        r = int(e.split()[0])
        d = [int("".join(x), 2) for x in zip(*[input().split() for _ in [0] * r])]
        a = 0
        for m in range(1 << ~-r):
            t = 0
            for s in d:
                c = bin(m ^ s).count("1")
                t += c if c > r // 2 else r - c
            if a < t:
                a = t
        print(a)


if "__main__" == __name__:
    v()

-for e in iter(input, "0 0"): -    r = int(e.split()[0]) -    d = [int("".join(x), 2) for x in zip(*[input().split() for _ in [0] * r])] -    a = 0 -    for m in range(1 << ~-r): -        t = 0 -        for s in d: -            c = bin(m ^ s).count("1") -            t += c if c > r // 2 else r - c -        if a < t: -            a = t -    print(a) +def v(): +    for e in iter(input, "0 0"): +        r = int(e.split()[0]) +        d = [int("".join(x), 2) for x in zip(*[input().split() for _ in [0] * r])] +        a = 0 +        for m in range(1 << ~-r): +            t = 0 +            for s in d: +                c = bin(m ^ s).count("1") +                t += c if c > r // 2 else r - c +            if a < t: +                a = t +        print(a) + + +if "__main__" == __name__: +    v()