A cuboid box is made without a lid, and it is 50 centimeters (cm) wide, 35 centimeters (cm) long, and 40 centimeters (cm) high. How many tiles do you need at least if you want to attach tiles that are 1 centimeter (cm) wide and 1 centimeter (cm) long to the outer surface of the box without any gap? 
50 35 [OP_MUL] 50 40 [OP_MUL] 2 [OP_MUL] 40 35 [OP_MUL] 2 [OP_MUL] [OP_ADD] [OP_ADD]
var_a = 50
var_b = 35
var_c = var_a * var_b
var_d = 50
var_e = 40
var_f = var_d * var_e
var_g = 2
var_h = var_f * var_g
var_i = 40
var_j = 35
var_k = var_i * var_j
var_l = 2
var_m = var_k * var_l
var_n = var_h + var_m
var_o = var_c + var_n
print(int(var_o))