Of the students who played on the playground, 16 went home, and 9 more came, resulting in a total of 25. How many students were playing on the playground at first?
25 9 [OP_SUB] 16 [OP_ADD]
var_a = 25
var_b = 9
var_c = var_a - var_b
var_d = 16
var_e = var_c + var_d
print(int(var_e))