There are 93 fish and birds in the pond. There are 66 fish and the bird eats one fish per day. If 21 new fish came into the pond the next day and the birds ate the fish, how many fish are in the pond?
66 93 66 [OP_SUB] [OP_SUB] 21 [OP_ADD]
var_a = 66
var_b = 93
var_c = 66
var_d = var_b - var_c
var_e = var_a - var_d
var_f = 21
var_g = var_e + var_f
print(int(var_g))