import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int k = sc.nextInt() ;
    	int[] nums = {1,2,3,4,5} ;
     	int sum = 0 ;
		int count=0;
		for(int i=0;i<nums.length;i++)
		{	 sum = 0 ;
			for(int j=i+1;j<nums.length;j++){
					sum = sum+ nums[j] ;
					if(sum == k){
				count++ ;		
}

    }} 
    System.out.print(count);
    }
}