#include<iostream>
using namespace std;

int fun(long long int x,long long int n)
{
	long long int m=1000000007;
	long long int ans =1;
	while(n>0)
	{
		if(n%2==1){
			ans=(ans*x)%m;
		}
		x=(x*x)%m;
		n=n/2;
	}
	return ans;
}

int main()
{
	int a,b;
	long long int i,t,ans;
	cin>>a>>b>>t;
	ans = ((long long int)(0.5*a*1+0.5*b*1))%1000000007;
	ans=fun(ans,t);
	cout<<ans<<endl;
}