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

int big_pow (int x, long long y)
{
    long long out = 1;
    long long base = x;
    while(y>0){
        if (y%2) out*=base;
        y/=2;
        base*=base;
        base%= 1000000007;
        out%= 1000000007;
        //cout<<base<<endl;
    }
    return out;

}

int main() {
    //cout<<big_pow(2, 21)<<endl;
    int a, b;
    long long t; 
    cin>>a>>b>>t;
    cout<<big_pow((a+b)/2, t)<<endl;
    return 0;
}