class dsu:
  def __init__(self,n):
    assert n>0,"n must be Natural"
    self.n=n
    self.parents=[-1]*n
    return
  
  def find(self,x):
    assert x<self.n,"warning!! this is 0 index"
    if self.parents[x]<0:
      return x
    self.parents[x]=self.find(self.parents[x])
    return self.parents[x]
  
  def merge(self,x,y):
    assert x<self.n and y<self.n,"warning!! this is 0 index"
    x=self.find(x)
    y=self.find(y)
    if x==y:
      return
    if self.parents[x]>self.parents[y]:
      x,y=y,x
    self.parents[x]+=self.parents[y]
    self.parents[y]=x
    return
    
  def size(self,x):
    assert x<self.n,"warning!! this is 0 index"
    return -self.parents[self.find(x)]
    
  def same(self,x,y):
    assert x<self.n and y<self.n,"warning!! this is 0 index"
    return self.find(x)==self.find(y)
  
  def leader(self,x):
    assert x<self.n,"warning!! this is 0 index"
    if self.parents[x]<0:
      return x
    self.parents[x]=self.leader(self.parents[x])
    return self.parents[x]
  
  def groups(self):
    ld=[self.leader(i) for i in range(self.n)]
    res=[[] for _ in range(self.n)]
    for i in range(self.n):
      res[ld[i]].append(i)
    return list(filter(lambda a:a !=[],res))
    
def lcs(S,T):
  dp=[[0]*(len(T)+1)for _ in[0]*(len(S)+1)]
  for i in range(1,len(S)+1):
    for j in range(1,len(T)+1):
      if S[i-1]==T[j-1]:
        dp[i][j]=dp[i-1][j-1]+1
      else:
        dp[i][j]=max(dp[i-1][j],dp[i][j-1])
  length=dp[len(S)][len(T)]
  i=len(S)
  j=len(T)
  ans=[]
  while length>0:
    if S[i-1]==T[j-1]:
      ans.append(S[i-1])
      i-=1
      j-=1
      length-=1
    elif dp[i][j]==dp[i-1][j]:
      i-=1
    else:
      j-=1
  return len(ans[::-1])

def main():
  N,M,Q=map(int,input().split())
  uf=dsu(N+M)
  for _ in[0]*Q:
    a,b=map(int,input().split())
    uf.merge(a-1,N+b-1)
  A=list(range(0,N))
  B=list(range(N,N+M))
  g=uf.groups()
  for i in g:
    for j in i:
      if j<N:
        A[j]=i[0]
      else:
        B[j-N]=i[0]
  ans=lcs(A,B)
  print(ans)
  return

main()