let termOfOffice = 5; // 5年任期
let numOfYear = 0;
let president;

while (true) {
  if (numOfYear % termOfOffice !== 0) {
    continue; // 未夠期換屆
  } else {
	president = getNextPresident(); // 換屆
  }
  
  if (president === '習近平') {
    termOfOffice = Infinity;
  }
  
  numOfYear++;
}