# Enter your code here. Read input from STDIN. Print output to STDOUT
def power(x,y):
  d=10**9+7
  if y==0:
    return 1
  temp=power(x,y/2)
  if y%2==0:
    return ((temp%d)*(temp)%d)%d
  else:
    return ((((x%d)*(temp)%d)%d)*(temp)%d)%d
a,b,t=map(int,raw_input().split())
c=(a+b)/2
d=power(c,t)
print d