#include<stdio.h>
int main()
{
int n,count=0,i;
printf(" enter a number : ");
scanf("%d",&n);
for(i=2;i<=n/2;i++)
{
if(n%i==0)
{
count++;
break;
}
}
if(count==0)
printf(" %d is a prime number \n",n);
else
printf(" %d is not a prime number \n",n);
return 0;
}