When you weighed a barrel full of fish of the same weight, it was 54 kilograms (kg). Then the barrel weighed 29 kilograms (kg) after being removed of the half of fish. What is the weight of fish that was in the barrel at first in kilograms (kg)?
54 29 [OP_SUB] 2 [OP_MUL]
var_a = 54
var_b = 29
var_c = var_a - var_b
var_d = 2
var_e = var_c * var_d
print(int(var_e))