#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int cells = 1;
int grow(int a, int t)
    {
    while(t>0)
    {t--;
    cells = cells*(a);
    }
    return cells;
}


int main() {
    int a,b,t;
    cin>>a>>b>>t;
    cout<<grow((a+b)/2,t)%(1000000007);
    return 0;
}