#include <cmath>
#include <cstdio>
#include <vector>
#include<map>
#include<stdio.h>
#include <iostream>
#include <algorithm>
using namespace std;

unsigned long long power(int imp,unsigned long long int t)
 {
    unsigned long long int t1;
    
     if(t==0)
         return 1;
     if(t==1)
         return imp;
     else
     {
        if(t%2==0)
        {
            t1= (power(imp,t/2))%1000000007;
            t1=(t1*t1)%1000000007;
            
            
        }
         else
        {
            t1= (power(imp,(unsigned long long int)(t/2)))%1000000007;
            t1=(t1*t1)%1000000007;
             t1*=imp%1000000007;
            
         }
     }
    return t1%1000000007;
 }


int main() 
{
    int a,b;
    unsigned long long t;
   
    unsigned long long int first;
    
    cin>>a>>b>>t;
    
    unsigned long long int imp=(a+b)*.5;
    unsigned long long x=1;
    
    
    x=power(imp,t);
    
   cout<<x;
    return 0;
}