X is a positive integer, so X = 4 1, X = 42, X = 43 or X = 44.
When x = 4 1, that is, the number of people is 4 1, the number of saplings is124;
When x = 42, that is, the number of saplings is126;
When x = 43, that is, the number of saplings is128;
When x = 44, that is, the number of people is 44, the number of saplings is 130.