import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        long t = in.nextLong();
        int base = (a + b)/2;
        long mod = 1000000007;
        BigInteger bigBase = BigInteger.valueOf(base);
        BigInteger time = BigInteger.valueOf(t);
        BigInteger modulus = BigInteger.valueOf(mod);
        System.out.println(modPow(bigBase, time, modulus));
    }
    
    public static BigInteger modPow(BigInteger base, BigInteger e, BigInteger m)
      {
        BigInteger result = BigInteger.ONE;
        base = base.mod(m);
        for (int idx = 0; idx < e.bitLength(); ++idx) {
          if (e.testBit(idx)) {
            result = result.multiply(base).mod(m);
          }
          base = base.multiply(base).mod(m);
        }
        return result;
      }
}