The rule says to round up to the next integer.
For example, the 1st integer above 2.7 is 3, for 9.89 is 10, for -2.3 is -2 and for 13 is 14.
Sure you know what the next integer above 13 is. The same for 3. The 1st integer ABOVE 3 is 4.
For the record, the 1st integer above 3 is not 3. Why? Because 3 is not above 3.