There are 3 pandas in the zoo. Let's say you give these pandas at least 2 bamboos. How many ways are there to distribute 20 bamboos?
20 3 2 [OP_MUL] [OP_SUB] 3 [OP_ADD] 1 [OP_SUB] 3 [OP_COMB]
var_a = 20
var_b = 3
var_c = 2
var_d = var_b * var_c
var_e = var_a - var_d
var_f = 3
var_g = var_e + var_f
var_h = 1
var_i = var_g - var_h
var_j = 3
var_k = 1
var_i = int(var_i)
var_j = int(var_j)
for i, elem in enumerate(range(var_j)):
    var_k = var_k * (var_i-i)
for i, elem in enumerate(range(var_j)):
    var_k = var_k / (i+1)
print(int(var_k))