@Test
 public void test() {
   BigFatInteger app = new BigFatInteger();
   assertEquals(app.minOperations(6, 1), 2);
 }
 @Test
 public void test2() {
   BigFatInteger app = new BigFatInteger();
   assertEquals(app.minOperations(999983, 9), 5);
 }
 @Test
 public void test3() {
   BigFatInteger app = new BigFatInteger();
   assertEquals(app.minOperations(360, 8), 8);
 }
 @Test
 public void test1() {
   BigFatInteger app = new BigFatInteger();
   assertEquals(app.minOperations(162, 1), 4);
 }