# Enter your code here. Read input from STDIN. Print output to STDOUT

a,b,t=raw_input().strip().split(' ')
a=int(a)
b=int(b)
t=int(t)

print pow((int((a+b)*.5)),t,1000000007)

#cells=(.5*(a+b)%1000000007)^t

#cells=1
#seconds=1
#while seconds<=t:
#    cells=((.5*(a%1000000007)*(cells%1000000007)%1000000007)+(.5*(b%1000000007)*(cells%1000000007)%1000000007))%1000000007
#    seconds+=1
print int(cells)