from functools import reduce

MOD = int( 1e9 ) + 7

H, W, K = map( int, input().split() )

def gcd( a, b ):
  if b == 0: return a
  return gcd( b, a % b )

def get_prime( x ):
  res = []
  _ = x
  i = 2
  while i * i <= _:
    if _ % i == 0:
      res.append( i )
      while _ % i == 0:
        _ //= i
    i += 1
  if _ > 1:
    res.append( _ )
  return res

hp, wp = get_prime( H ), get_prime( W )

def phi( x, memo = {} ):
  if x in memo:
    return memo[ x ]
  if H % x == 0:
    res = x
    for p in hp:
      if p > x: break
      if x % p == 0:
        res = res // p * ( p - 1 )
    memo[ x ] = res
    return res
  else:
    res = x
    for p in wp:
      if p > x: break
      if x % p == 0:
        res = res // p * ( p - 1 )
    memo[ x ] = res
    return res

def factors( n ):
  return set( reduce( list.__add__, ([i, n//i] for i in range(1, int(n**0.5) + 1) if n % i == 0)))

hf, wf = factors( H ), factors( W )

ans = 0
for a in hf:
  for b in wf:
    ans += pow( K, H // a * W // b * gcd( a, b ) % ( MOD - 1 ), MOD ) * phi( a ) * phi( b )
    ans %= MOD

ans = ans * pow( H * W, MOD - 2, MOD ) % MOD

print( ans )