#include<bits/stdc++.h>
#define ll long long int
using namespace std;
ll mod=1e9+7;
ll fastPow(ll a,ll b,ll mod)
{
	if(b==0)
	return 1;
	ll half=fastPow(a,b/2,mod)%mod;
	if(b%2==0)
	return (half*half)%mod;
	return (((half*half)%mod)*a)%mod;
}
int main()
{
	ll a,b;
	ll t;

	cin>>a>>b>>t;
	a=a+b;
	ll mmi=fastPow(2,t,mod);
	mmi=fastPow(mmi,mod-2,mod);
	ll ans=(fastPow(a,t,mod)*mmi)%mod;
	//ans/=2;
    cout << ans ;
	return 0;
}