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


public class Main_yukicoder673 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		final int MOD = 1_000_000_007;

		long b = sc.nextLong();
		long c = sc.nextLong();
		long d = sc.nextLong();

		pr.println(f(d, MOD, c % MOD, b % MOD));
    }

	private static long f(long n, int MOD, long c, long b) {
		long[] a = {c, c * b % MOD, 0, 1};
		long[] x = {0, 1};
		while(n > 0) {
			if (n % 2 != 0) {
				long tmp0 = (x[0] * a[0] + x[1] * a[1]) % MOD;
				long tmp1 = (x[0] * a[2] + x[1] * a[3]) % MOD;
				x[0] = tmp0;
				x[1] = tmp1;
			}
			long tmp0 = (a[0] * a[0] + a[1] * a[2]) % MOD;
			long tmp1 = a[1] * (a[0] + a[3]) % MOD;
			long tmp2 = a[2] * (a[0] + a[3]) % MOD;
			long tmp3 = (a[3] * a[3] + a[1] * a[2]) % MOD;
			a[0] = tmp0;
			a[1] = tmp1;
			a[2] = tmp2;
			a[3] = tmp3;
			n /= 2;
		}

		return x[0];
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(INPUT == null ? System.in : new ByteArrayInputStream(INPUT.getBytes()));
		pr = new Printer(System.out);

		solve();

//		pr.close();
		pr.flush();
//		sc.close();
	}

	static String INPUT = null;

	private static class Printer extends PrintWriter {
		Printer(OutputStream out) {
			super(out);
		}
	}
}