import java.util.Scanner;

class no211{
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int k,i,j,a[]= {2,3,5,7,11,13},b[]= {4,6,8,9,10,12},s=0;
		k=stdIn.nextInt();
		for(i=0;i<6;i++) for(j=0;j<6;j++) if(k==a[i]*b[j]) s++;
		System.out.print(s/36.);
	}
}