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

ll modular_pow(ll base, ll exponent, ll modulus)
{
    ll result = 1;
    while (exponent > 0)
    {
        if (exponent % 2 == 1)
            result = (result * base) % modulus;
        exponent = exponent >> 1;
        base = (base * base) % modulus;
    }
    return result;
}



int main() {
    int a,b;
    unsigned long long  int t;
    cin>> a>>b>>t;
    float p = (a+b)*0.5;
    printf("%lld",modular_pow(p,t,1000000007));
    return 0;
}