#include<bits/stdc++.h>
using namespace std;

long long int ppo = 1000000007;

long long int p(int x, long long int n) 
    {
        if (n == 0)
            return 1;
        else if (n % 2 == 0)
            return p(x, (n / 2))%ppo * p(x, (n / 2))%ppo;
        else
            return x * p(x, ((n - 1) / 2))%ppo * p(x, ((n - 1) / 2))%ppo;
    }

int main() {
    long long int sum;
    int a, b;
    
    long long int t;
    cin>>a>>b>>t;
    int y = (a+b)/2;
    sum = p(y,t);
    sum = sum%ppo;
    cout<<sum;
}