When Beomjin wants to put two math books and two English books on the bookshelf, in how many ways can the math books be placed together?
3 3 [OP_PERM] 2 [OP_MUL]
var_a = 3
var_b = 3
var_c = 1
var_a = int(var_a)
var_b = int(var_b)
for i, elem in enumerate(range(var_b)):
    var_c = var_c * (var_a-i)
var_d = 2
var_e = var_c * var_d
print(int(var_e))