#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define mod 1000000007
#define ll long long 
using namespace std;

ll int power(ll int x, ll int y)
{
        ll int res = 1;
        x = x % mod;
        while (y > 0)   {
                if (y & 1)
                        res = (res*x) % mod;

                y = y>>1;
                x = (x*x) % mod;
        }
        return res;
}

ll int expectedGrowth(ll int a,ll int b,ll int t){
       // t = t % mod;
        ll int v;
        v=0.5*(a+b);
        v=power(v,t);
        return v;
}

int main() {
        ll int t,a,b;
        cin>>a>>b>>t;
        cout<<expectedGrowth(a,b,t)<<endl;
        return 0;
}