#include <stdio.h>

int main(void){
     int i=2,num=1;

     while(!(0)){
          i=2;
          while(i<(num/2)){
               if(!(num%i))
                    break;
               i++;
          }
          if(i==(num/2))
               printf("%d\t",num);
          num++;
     }
}