---

package javaapplication10;
 import java.util.Scanner;

public class JavaApplication10 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

                Scanner g = new Scanner(System.in);
         int b,q;
         while(g.hasNextInt()){
         b = g.nextInt();                                                                        
                 q=0;
         for(int i=3; i<b;i+=2){
             if(b%i==0 ||b%2==0){q++;break;}
         }
                 if(q!=0){System.out.println("非質數");}
                 else{System.out.println("質數");}
                 }

    }
}