Eight students stand in a line to borrow books. How many students are standing between the student standing 1st from the front and the student standing 4th from the back?
8 1 [OP_SUB] 4 [OP_SUB]
var_a = 8
var_b = 1
var_c = var_a - var_b
var_d = 4
var_e = var_c - var_d
print(int(var_e))