import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static final long MOD = 1000000007;
	public static final int SIZE = 2;
	
	public static long[][] mat_pow(long[][] mat, long p){
		if(p == 0){
			return new long[][]{{1, 0}, {0, 1}};
		}else if(p == 1){
			return mat;
		}else if(p % 2 != 0){
			return mat_mul(mat, mat_pow(mat, p - 1));
		}else{
			final long[][] ret = mat_pow(mat, p / 2);
			return mat_mul(ret, ret);
		}
	}
	
	public static long[][] mat_mul(long[][] mat1, long[][] mat2){
		long[][] ret = new long[SIZE][SIZE];
		
		for(int i = 0; i < SIZE; i++){
			for(int j = 0; j < SIZE; j++){
				for(int k = 0; k < SIZE; k++){
					ret[i][j] += mat1[i][k] * mat2[k][j];
					ret[i][j] %= MOD;
				}
			}
		}
		
		return ret;
	}
	
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long B = sc.nextLong();
		final long C = sc.nextLong();
		final long D = sc.nextLong();

		final long B_mod = B % MOD;
		final long C_mod = C % MOD;

		if(D == 1){
			System.out.println((B_mod * C_mod) % MOD);
			return;
		}
		
		
		final long[][] snd = mat_pow(new long[][]{{C_mod, 0}, {1, 1}}, D - 2);
		final long[][] fst = mat_mul(new long[][]{{C_mod, 0}, {(C_mod + 1) % MOD, 1}}, snd);
		//System.out.println(Arrays.deepToString(fst));
		
		final long X = (fst[1][0] * B_mod) % MOD;
		final long X_ = (X * C_mod) % MOD;
		System.out.println((X_) % MOD);
	}
}