The academy is on the 7th floor. The reading room is 4 floors higher than the academy, and the bookstore is 9 floors lower than the reading room. What floor is the bookstore on?
7 4 [OP_ADD] 9 [OP_SUB]
var_a = 7
var_b = 4
var_c = var_a + var_b
var_d = 9
var_e = var_c - var_d
print(int(var_e))