There are some pieces of paper tape of 18 centimeters (cm) each, and 12 pieces of it are overlapped to form a round ring with a circumference of 210 centimeters (cm). If the length of the overlapped part is the same, write down how much is it in millimeters (mm).

18 12 [OP_MUL] 210 [OP_SUB] 12 [OP_DIV] 10 [OP_MUL]
var_a = 18
var_b = 12
var_c = var_a * var_b
var_d = 210
var_e = var_c - var_d
var_f = 12
var_g = var_e / var_f
var_h = 10
var_i = var_g * var_h
print(int(var_i))