import random
s=set()
L,R,M=map(int,input().split())
degL=[0]*L
degR=[0]*R
for i in range(M):
    a,b=map(int,input().split())
    assert (a,b) not in s
    s.add((a,b))
    degL[a]+=1
    degR[b]+=1
assert 0 not in degL
assert 0 not in degR
print(0) #WA