A ballpoint pen is 20 centimeters (cm) long and a pencil is 16 centimeters (cm) long. What is the average of the two writing instruments in centimeters (cm)?
20 16 [OP_ADD] 2 [OP_DIV]
var_a = 20
var_b = 16
var_c = var_a + var_b
var_d = 2
var_e = var_c / var_d
print(int(var_e))