If there are 5 members A, B, C, D, and E, find the number of cases in which one president, one vice president, and one manager are selected.
5 1 1 [OP_ADD] 1 [OP_ADD] [OP_PERM]
var_a = 5
var_b = 1
var_c = 1
var_d = var_b + var_c
var_e = 1
var_f = var_d + var_e
var_g = 1
var_a = int(var_a)
var_f = int(var_f)
for i, elem in enumerate(range(var_f)):
    var_g = var_g * (var_a-i)
print(int(var_g))