#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
long long Mod = 1000000007;

long long power(long long x,long long y)
    {

    long long res = 1;     // Initialize result
  x=x%Mod;
    while (y > 0)
    {
        // If y is odd, multiply x with result
        if (y & 1)
            res = (res*x)%Mod;
  
        // n must be even now
        y = y>>1; // y = y/2
        x = (x*x)%Mod;  // Change x to x^2
    }
    return res;

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