【java练习题37】

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner s=new Scanner(System.in);
int n=s.nextInt();
boolean[] arr=new boolean[n];
for (int i = 0; i < arr.length; i++) {
arr[i]=true;
}
int left=n;
int countNum=0;
int index=0;
while(left>1){
if(arr[index]){
countNum++;
if(countNum==3){
arr[index]=false;
left--;
countNum=0;
}
}
index++;
if(index==n){
index=0;
}
}

for (int i = 0; i < arr.length; i++) {
if(arr[i]){
System.out.println(i+1);
}
}
}