import java.util.Scanner;

public class HelloWorld {

	    public static void main(String[] args) throws Exception {

	    	Scanner sc = new Scanner(System.in);
	    	long n = sc.nextLong();
	    	sc.close();

	    	long e = 1;
	    	for (int i = 0; i < n; i ++) {
	    		e = e * 10 + 3;
	    	}

	    	System.out.println(e % 1000000007);
	    	}

}