The length of each side of the parallelogram is 18 centimeters (cm) and 12 centimeters (cm), respectively. Find the circumference of this parellelogram.
18 12 [OP_ADD] 2 [OP_MUL]
var_a = 18
var_b = 12
var_c = var_a + var_b
var_d = 2
var_e = var_c * var_d
print(int(var_e))