package ciur;
import java.io.*;
import java.util.*;
import java.lang.*;
public class Ciur {

    public Scanner x;
    String a = "";
    int n;
    int nr = 0;
     boolean b ; 
    public void openFile(){
        try{
            x = new Scanner(new File("C:\\numar.txt"));
        }catch(Exception e){
            System.out.println("nu exista fisierul!"); 
        }
    }
    public void readFile(){
        
        while(x.hasNext()){
            a = x.next();
        }
        n = Integer.parseInt(a);
        
    }
    public void closeFile(){
        x.close();
    }
    
    public int ciur(){
        
        for(int i = 2 ; i <= n ; i++){
            b = true;
            for (int j = 2 ; j <= n ; j++){
                if ((i % j == 0) && (i != j)){
                    b = false;
                    break;
                }
                if (b == false){
                    break;
                }
            }
            
            if(b == true){
                nr = nr + 1;
            }
        }
        
        return nr;
        
        
    }
   
}