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#include <stdio.h>
#include <string.h>
#define SIZE 100
int n, m, p, count;
int a[SIZE][SIZE];
void colour(int x, int y)
{
count++;
a[x][y] = 1;
if ((x > 1) && (a[x - 1][y] == 0))
colour(x - 1, y);
if ((y > 1) && (a[x][y - 1] == 0))
colour(x, y - 1);
if ((x < n) && (a[x + 1][y] == 0))
colour(x + 1, y);
if ((y < m) && (a[x][y + 1] == 0))
colour(x, y + 1);
}
int main()
{
int i, j, x, y, ans;
memset(a, 0, sizeof(a));
scanf("%d%d%d", &n, &m, &p);
for (i = 1; i <= p; i++) {
scanf("%d%d", &x, &y);
a[x][y] = 1;
}
ans = 0;
for (i = 1; i <= n; i++)
for (j = 1; j <= m; j++)
if (a[i][j] == 0) {
count = 0;
colour(i, j);
if (ans < count)
ans = count;
}
printf("%d\n", ans);
return 0;
}
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