There are weights of 1 gram (g), 2 grams (g), 4 grams (g), and 8 grams (g) each in the lab. How many different weights can you measure using these weights?
2 4 [OP_POW] 1 [OP_SUB]
var_a = 2
var_b = 4
var_c = var_a ** var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))