/**
 * https://www.hackerrank.com/contests/rookierank/challenges/extremely-dangerous-virus
 * All Contests  RookieRank  Extremely Dangerous Virus
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Solution {
	public static void main(String[] args) throws NumberFormatException, IOException {
		FasterScanner sc = new FasterScanner(System.in);
		long aGrowthFactor = sc.nextLong();
		long bGrowthFactor = sc.nextLong();
		long a = (aGrowthFactor + bGrowthFactor) / 2;
		long tNumberOfPeriods = sc.nextLong();
		long series = 1;

		// population = growth ^ time
		series = myPower(a, tNumberOfPeriods);

		System.out.println(series);

		sc.close();
	}

	static long myPower(long base, long exponent) {
		long result = 1;
		long M = 1000000007;

		// calculate the power using the squares method.
		while (exponent > 0) {
			if ((exponent & 1) == 1) {
				// found a power of 2 in the exponent
				result = (result * base) % M;
			}
			// next power of 2
			exponent >>= 1;
			base = (base * base) % M;
		}
		return result;
	}

	/** Buffered replacement for the java.util.Scanner */
	static class FasterScanner {
		private static BufferedReader _reader;
		private static StringTokenizer _parser;

		public FasterScanner(InputStream input) {
			_reader = new BufferedReader(new InputStreamReader(input));
			_parser = new StringTokenizer("");
		}

		/**
		 * Get the next string token from the buffer.
		 */
		public String next() throws IOException {
			while (!_parser.hasMoreTokens()) {
				_parser = new StringTokenizer(_reader.readLine());
			}
			return _parser.nextToken();
		}

		/**
		 * Get the next line of text from the buffer.
		 */
		public String nextLine() throws IOException {
			try {
				return _reader.readLine();
			} catch (IOException ex) {
				return null;
			}
		}

		/**
		 * Get the next int from the buffer.
		 */
		public int nextInt() throws NumberFormatException, IOException {
			return Integer.parseInt(next());
		}

		/**
		 * Get the next long from the buffer.
		 */
		public long nextLong() throws NumberFormatException, IOException {
			return Long.parseLong(next());
		}

		/**
		 * Close the scanner.
		 */
		public void close() throws IOException {
			_parser = null;
			if (_reader != null) {
				_reader.close();
				_reader = null;
			}
		}
	}
}