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

#define p 1000000007
/* Function to calculate x raised to the power y in O(logn)*/
long long int power(long long int x, long long int y)
{
    long long int temp;
    if( y == 0)
        return 1;
    temp = power(x, y/2);
    if (y%2 == 0)
        return ((temp%p)*(temp%p)%p);
    else
        return ((((x%p)*(temp%p))%p)*(temp%p))%p;
}

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