/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
    public static int solution(int n){
 
        if(n==1 || n==2 || n==3) return 1;
        if(n==4) return 2;
        int[] dp = new int[n];
        dp[0] = 1;
        dp[1] = 1;
        dp[2] = 1;
        dp[3] = 2;
        for(int i=4;i<n;i++){
            dp[i] = (dp[i-1] % 1000000007 + dp[i-4] % 1000000007 ) % 1000000007;
        }
        return dp[n-1];
}
	public static void main (String[] args) throws java.lang.Exception
	{
	    Scanner scn = new Scanner(System.in);
        int n = scn.nextInt();
        System.out.println(solution(n));
	}
}

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8