It is said that Geun-bae jump ropes twice as many times as he skipped the previous day. If Geun-bae did 15 times on the first day, find out how many times he will do it on the fourth day.
15 2 4 1 [OP_SUB] [OP_POW] [OP_MUL]
var_a = 15
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))