public class ThreeOut {	public static void main(String[] args) { 		boolean[] arr = new boolean[500];		for(int i = 0; i < arr.length; i++) {			arr[i] = true;		}				int leftCount = arr.length;		int countNum = 0;		int index = 0;				while(leftCount > 1) {			if(arr[index] == true) {				countNum ++;								if(countNum == 3) {					countNum = 0;					arr[index] = false;					leftCount --;				}			}						index ++;						if(index == arr.length) {				index = 0;			}		}				for(int i = 0; i < arr.length; i++) {			if(arr[i] == true) {				System.out.println(i + 1);			}		}			}}