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


long long int power1(long long int x, long long  int y,long long int p)
{
    long long int res = 1;      
 
    x = x % p;  
 
    while (y > 0)
    {
        
        if (y & 1)
            res = (res*x) % p;
 
       
        y = y>>1; 
        x = (x*x) % p;  
    }
    return res;
}


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    
    long long int y,x,z;
	long long int a=0,b=0;
	long long int T;
	long long int answer=0;
	
	cin>>a;
	cin>>b;
	cin>>T;
	
	x=(0.5*(a+b));
	z=pow(10,9)+7;
	y=power1(x,T,z);
	
	
	answer=y;
	
	
	cout<<answer<<endl;
	
	
    return 0;
}