There is a perimeter of 210 centimeters (m) round ring made by connecting 12 sheets of paper tape whose length is 18 centimeters (cm). If the overlapped parts of the tape is the same, find how much is overlapped 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))