Hoseok subtracted 7 from a certain number to get 9. What is the result of multiplying this number by 3?
9 7 [OP_ADD] 3 [OP_MUL]
var_a = 9
var_b = 7
var_c = var_a + var_b
var_d = 3
var_e = var_c * var_d
print(int(var_e))