There are two types of Korean language workbooks and four types of math workbooks. When choosing one book among them, in how many cases can you choose Korean workbook or math workbook?
2 4 [OP_ADD] 1 [OP_COMB]
var_a = 2
var_b = 4
var_c = var_a + var_b
var_d = 1
var_e = 1
var_c = int(var_c)
var_d = int(var_d)
for i, elem in enumerate(range(var_d)):
    var_e = var_e * (var_c-i)
for i, elem in enumerate(range(var_d)):
    var_e = var_e / (i+1)
print(int(var_e))