h,w,m = ( int(x) for x in input().split() )



h_array = [ 0 for i in range(h) ]

w_array = [ 0 for i in range(w) ]

ps = set()

for i in range(m):

    hi,wi = ( int(x)-1 for x in input().split() )

    h_array[hi] += 1

    w_array[wi] += 1

    ps.add( (hi,wi) )

h_great = max(h_array)

w_great = max(w_array)

h_greats = list()

w_greats = list()

for i , hi in enumerate(h_array):

    if hi == h_great:

        h_greats.append(i)

for i , wi in enumerate(w_array):

    if wi == w_great:

        w_greats.append(i)



ans = h_great + w_great





for _h in h_greats:

    for _w in w_greats:

        if (_h,_w) in ps:

            continue

        print(ans)

        exit()



print((ans-1))
import sys

input = sys.stdin.readline



h,w,m = list(map(int,input().split()))



h_array = [ 0 for i in range(h) ]

w_array = [ 0 for i in range(w) ]

ps = set()

for i in range(m):

    hi,wi = [int(x) - 1 for x in input().split()]

    h_array[hi] += 1

    w_array[wi] += 1

    ps.add( (hi,wi) )



h_great = max(h_array)

w_great = max(w_array)

h_greats = list()

w_greats = list()

for i , hi in enumerate(h_array):

    if hi == h_great:

        h_greats.append(i)

for i , wi in enumerate(w_array):

    if wi == w_great:

        w_greats.append(i)



ans = h_great + w_great





for _h in h_greats:

    for _w in w_greats:

        if (_h,_w) in ps:

            continue

        print(ans)

        exit()



print((ans-1))
h, w, m = (int(x) for x in input().split())
h_array = [0 for i in range(h)]
w_array = [0 for i in range(w)]
ps = set()
for i in range(m):
    hi, wi = (int(x) - 1 for x in input().split())
    h_array[hi] += 1
    w_array[wi] += 1
    ps.add((hi, wi))
h_great = max(h_array)
w_great = max(w_array)
h_greats = list()
w_greats = list()
for i, hi in enumerate(h_array):
    if hi == h_great:
        h_greats.append(i)
for i, wi in enumerate(w_array):
    if wi == w_great:
        w_greats.append(i)
ans = h_great + w_great
for _h in h_greats:
    for _w in w_greats:
        if (_h, _w) in ps:
            continue
        print(ans)
        exit()
print((ans - 1))

import sys

input = sys.stdin.readline
h, w, m = list(map(int, input().split()))
h_array = [0 for i in range(h)]
w_array = [0 for i in range(w)]
ps = set()
for i in range(m):
    hi, wi = [int(x) - 1 for x in input().split()]
    h_array[hi] += 1
    w_array[wi] += 1
    ps.add((hi, wi))
h_great = max(h_array)
w_great = max(w_array)
h_greats = list()
w_greats = list()
for i, hi in enumerate(h_array):
    if hi == h_great:
        h_greats.append(i)
for i, wi in enumerate(w_array):
    if wi == w_great:
        w_greats.append(i)
ans = h_great + w_great
for _h in h_greats:
    for _w in w_greats:
        if (_h, _w) in ps:
            continue
        print(ans)
        exit()
print((ans - 1))

-h, w, m = (int(x) for x in input().split()) +import sys + +input = sys.stdin.readline +h, w, m = list(map(int, input().split())) -    hi, wi = (int(x) - 1 for x in input().split()) +    hi, wi = [int(x) - 1 for x in input().split()]