__author__ = 'Zlobober'
n, m, q = map(int, raw_input().split())
F = [list(map(int, raw_input().split())) for i in range(n)]

def calc(i):
    ans = 0
    l = -1
    for j in range(m):
        if F[i][j] == 0:
            l = j
        else:
            ans = max(ans, j - l)
    return ans

row = list(map(calc, range(n)))

for i in range(q):
    y, x = map(int, raw_input().split())
    y -= 1
    x -= 1
    F[y][x] = 1 - F[y][x]
    row[y] = calc(y)
    print max(row)