There are 45 ducks and 28 geese on the farm. Also, hens are 13 less than ducks, and roosters are 9 more than geese. How many chickens are there in the farm in total?
45 13 [OP_SUB] 28 9 [OP_ADD] [OP_ADD]
var_a = 45
var_b = 13
var_c = var_a - var_b
var_d = 28
var_e = 9
var_f = var_d + var_e
var_g = var_c + var_f
print(int(var_g))