#include <stdio.h>
#include <conio.h>
#include <iostream>

using namespace std;
int main()
{
    int a,i;
    while(1){
   
   cout<<"\nEnter Number to problem  :  ";
   cin>>a;
    for (i=2;a>i;i++)
        if (a%i==0)
            break;
    if (i==a)
       cout<<"\t\t\t\t"<<"Yes, is Aval \n\n";
    else
        cout<<"\t\t\t\t"<<"Not! \n\n";
        
         }
    getch();
}