public class Question1 {
	
	public static void main(String[] args) {
		
		int sum = 0;
		int cnt = 1;
		while (sum < 20) {
  			sum = sum + cnt;
  			if (cnt%3 == 0)
    			cnt = cnt+2;
  			else if (cnt%3 == 1)
    			cnt = cnt+1;
  			else
    			cnt = cnt+4;
  			System.out.println("sum = "+sum+" cnt = "+cnt);
		}

	}
}