import java.util.*;

public class Main {
	public static void main(String[] args) {
	    
	    // 標準入力を受け取る
	    Scanner sc = new Scanner(System.in);
        Long n = sc.nextLong();
        int result = 0;
        
        
        for(long l = 1; l <= n; l++) {
            
            if(l % 15 == 0) {
                result += 4;
            }else if(l % 3 == 0) {
                result += 2;
            }else if(l % 5 == 0) {
                result += 2;
                
            }
        }
        System.out.println(result);
	}
}