#include<bits/stdc++.h>
#define pb push_back
#define M 1000000007
using namespace std;
typedef long long ll;
ll power(ll a, ll b)
{
	if(b==0) return 1;
	ll ans = power(a,b/2);
	ans = (ans*ans)%M;
	if(b&1) ans = (ans*a)%M;
	return ans;
}
int main()
{
	ll a,b,t,n, twoInv = power(2,M-2);
	cin>>a>>b>>t;
    n = a+b;
    ll num = power(n, t);
    twoInv = power(twoInv,t);
    num = (num*twoInv) %M;
    cout<<num<<endl;
	return 0;
}