You are attaching posters measuring 30 centimeters (cm) in width and 20 centimeters (cm) in height to the wall. 15 posters are to be attached horizontally in succession, overlapping each other by 2 centimeters (cm). Find the minimum width of the wall in centimeters (cm) to attach all the posters. 
30 15 [OP_MUL] 15 1 [OP_SUB] 2 [OP_MUL] [OP_SUB]
var_a = 30
var_b = 15
var_c = var_a * var_b
var_d = 15
var_e = 1
var_f = var_d - var_e
var_g = 2
var_h = var_f * var_g
var_i = var_c - var_h
print(int(var_i))