You made a mistake in multiplying 36 by a number, so I added a number to 63 instead. Suppose that you got 70. How much is it if you calculate it correctly?
36 70 63 [OP_SUB] [OP_MUL]
var_a = 36
var_b = 70
var_c = 63
var_d = var_b - var_c
var_e = var_a * var_d
print(int(var_e))