#include <iostream>
#include <stdio.h>
#include <bits/stdc++.h>

#define f first
#define s second

using namespace std;

long long power(long long val, long long time)
{
    if(time == 0)
        return 1;
    if(time % 2 == 0)
    {
        long long ans = power(val, time / 2);
        ans = ans % 1000000007;
        ans = ans * ans;
        ans = ans % 1000000007;
        return ans;
    }else{
        long long ans = val * power(val, time - 1);
        ans = ans % 1000000007;
        return ans;
    }
}

int main(){
    long long a,b,t;
    cin >> a >> b >> t;
    long long val = (a + b) / 2;
    long long ans = power(val, t);
    cout << (ans % 1000000007) << endl;
    return 0;
}