Hyungyeong decided to do 18 hula hoops on the first day, twice the first day on the second day, and twice the second day on the third day. If Hyungyeong does the hula hoop in the same way, find out how many times she should do on the fourth day.
18 2 4 1 [OP_SUB] [OP_POW] [OP_MUL]
var_a = 18
var_b = 2
var_c = 4
var_d = 1
var_e = var_c - var_d
var_f = var_b ** var_e
var_g = var_a * var_f
print(int(var_g))