import sys
def power(g_base,a,p_mod):
  x=1
  bits = "{0:b}".format(a)
  for i, bit in enumerate(bits):
    if bit=='1': x = (((x**2)*g_base)%p_mod)
    elif bit=='0': x = ((x**2)%p_mod)
  return x%p_mod

a,b,t = raw_input().strip().split(' ')
base = (( int(a)+ int(b) ) /2 )
res = power(base, long(t), 1000000007)
print("%d" % res)