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

const int size=1000000007;
long long int power(int x, unsigned long long int y)
{
    if( y == 0)
        return 1;
    else if (y%2 == 0)
        return ((power(x, y/2)%size)*(power(x, y/2)%size))%size;
    else
        return ((x*power(x, y/2)%size)*(power(x, y/2)%size))%size;
 
}

int main() {
    int a; int b;
    unsigned long long int t;
    cin >> a;
    cin >> b;
    cin >> t;
    int x = (a+b)/2 ;
   
  long long int n = power(x,t);
    cout << n;
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}