import java.io.*;
import java.util.*;

class Solution {
    long ans(long n,long t)
    {
       long res=1;
       while(t>0)
       {
         if(t%2!=0)
           res=(res*n)%1000000007;
         t=t/2;
         n=(n*n)%1000000007;
       }  
       return res;
    }
    public static void main(String[] args) {
       Scanner sc=new Scanner(System.in);
       int a,b;
       long t,res;
       a=sc.nextInt();
       b=sc.nextInt();
       t=sc.nextLong();
       long c=(long)((a+b)*0.5);
       Solution s=new Solution();
       res=s.ans(c,t);
       System.out.println(res);
      }
}