Two people try to share 20 apples. If you say every person should have at least one, how many ways are there?
20 2 [OP_SUB] 1 [OP_ADD]
var_a = 20
var_b = 2
var_c = var_a - var_b
var_d = 1
var_e = var_c + var_d
print(int(var_e))