#include<stdio.h>
int main()
{
int n,i,flag=0;
printf("enter the no : ");
scanf("%d",&n);
for(**2;i<=n/2;++i)
{
if(n%i==0){
        flag = 1;
        break;
        }

}
if(flag==0) 
printf(" prime no"); 
else
printf(" not prime no");
return 0;
}