//0
if (check(0)) {
 while(1) {
  //1
  if (!(check(1))) {
   break;
  }
 }
 while(1) {
  //2
  if (!(check(2))) {
   break;
  }
 }
 //3
} else {
 goingFrom0to4();
 while(1) {
  //4
  if (!(check(4))) {
   break;
  }
 }
 while(1) {
  //5
  if (check(5)) {
   break;
  }
 }
 //3
}