#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>

#define MOD 1000000007L
using namespace std;

typedef unsigned long long ull;

ull pow(ull base, ull exp){
    ull res = 1;
    while(exp > 0){
        if(exp % 2 == 1){
            res = res*base % MOD;
        }
        base = base*base % MOD;
        exp /= 2;
    }
    return res % MOD;
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    ull t, a, b;
    cin >> a >> b >> t;
    cout << pow((a+b)/2, t) <<'\n';
    return 0;
}