def pow (x,t)
	if t==0
		return 1
	end 
	temp=pow(x,t/2)

	if t%2==0
		return temp*temp% (1000000007)
	else
		return x*temp*temp% (1000000007)
	end
end
a,b,t=gets.strip.split(" ").map(&:to_i)
x=(a+b)*0.5
x=x.round
ans=pow(x,t)
print ans