import java.util.*;
class virus
{
    public static void main(String args[])
    {
        Scanner ex=new Scanner(System.in);
        long a=ex.nextLong();
        long b=ex.nextLong();
        a=a+b;
        a=a/2;
        long a1=a;
        long t=ex.nextLong();
        long modulo=1000000007;
        int flag=1;
        String bin="";
        while(t>0)
        {
            if(t%2==1)
            bin="1"+bin;
            else
            bin="0"+bin;
            t=t/2;
        }
        int len=bin.length();
        for(int i=1;i<len;i++)
        {
            if(bin.charAt(i)=='1')
            a1=(((a1*a1)%modulo)*a)%modulo;
            else
            a1=(a1*a1)%modulo;
        }
        System.out.println(a1);
    }
}