#input of int(split by space)
def get_i()
  return gets.chomp.split(" ").map(&:to_i)
end
#input of float(split by space)
def get_f()
  return gets.chomp.split(" ").map(&:to_f)
end
#input of string(split by space)
def get()
  return gets.chomp.split(" ")
end
#input of string(split per one character)
def get_nsp()
  return gets.chomp.split("")
end
#yes or no decision
def yn_judge(bool,y="Yes",n="No")
  return bool ? y : n 
end
#create of array
def array(size1,init=nil,size2=-1)
  if size2==-1
      return Array.new(size1){init}
  else
      return Array.new(size2){Array.new(size1){init}}
  end
end

def max(a,b)
    return a>b ? a : b
end

def min(a,b)
    return a>b ? b : a
end

INF=Float::INFINITY

H,W,M=get_i
we=array(H,0)
he=array(W,0)
kind=Hash.new(0)
M.times do
    h,w=get_i
    h-=1
    w-=1
    we[h]+=1
    he[w]+=1
    kind[h.to_s+":"+w.to_s]+=1
end

ans=0
mh=0
mw=0
H.times do|i|
    mh=i if we[mh]<=we[i]
end
ans=0
W.times do|i|
  v=we[mh]+he[i]-kind[mh.to_s+":"+i.to_s]
  ans=max(ans,v)
end
puts ans