#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
#define m 1000000007;
unsigned long long power(unsigned long long x,unsigned long long y)
{
    unsigned long long res = 1;     // Initialize result
 
    while (y > 0)
    {
        // If y is odd, multiply x with result
        if (y & 1)
            res = (res*x)%m;
  
        // n must be even now
        y = y>>1; // y = y/2
        x = (x*x)%m;  // Change x to x^2
    }
    return res;
}
int main() {
    unsigned long long a,b;
    unsigned long long int t,ans;
    cin>>a>>b>>t;
    int c=(a+b)/2;
    ans=power(c,t);
    cout<<(ans)<<endl;
    return 0;
}