Yoojung had several notebooks. Among them, she gave 5 books to her older sister and gave half of the rest to her younger sister. If there are 4 notebooks left, how many notebooks did Yoojung have at first?
4 2 [OP_MUL] 5 [OP_ADD]
var_a = 4
var_b = 2
var_c = var_a * var_b
var_d = 5
var_e = var_c + var_d
print(int(var_e))