# Enter your code here. Read input from STDIN. Print output to STDOUT
# Enter your code here. Read input from STDIN. Print output to STDOUT
a,b,t=map(int,raw_input().strip().split(' '))
#print int((.5*a*t+.5*b*t)%(10**9+7))
temp=(a+b)/2
prev=1
modu=10**9+7
print int(pow(temp,t,modu))