import java.util.Scanner;

public class No314 {

  int all = 0;

  public No314(int i){
    kenkenpa(i,0,0);
    if(all>=Math.pow(10,9)+7)
        all%=Math.pow(10,9)+7;
    System.out.println(all);
  }

  public void kenkenpa(int i,int now,int k) {
    if(now==i){
      all++;
      k=4;
    }
    if(k==0){
      kenkenpa(i,now+1,1);
    }else if(k<2) {
      kenkenpa(i,now+1,k+1);
      kenkenpa(i,now+1,0);
    }else if(k==2){
      kenkenpa(i,now+1,0);
    }
  }

  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int i = sc.nextInt();
    new No314(i);
  }
}