Find the number of diagonals of the nonagon.
9 9 3 [OP_SUB] [OP_MUL] 2 [OP_DIV]
var_a = 9
var_b = 9
var_c = 3
var_d = var_b - var_c
var_e = var_a * var_d
var_f = 2
var_g = var_e / var_f
print(int(var_g))