Five different drinks are sold in a convenience store. You are going to pick three of them and give one to your friend, one to your younger brother, and one to your older sister. Find the number of cases in this situation.
5 3 [OP_PERM]
var_a = 5
var_b = 3
var_c = 1
var_a = int(var_a)
var_b = int(var_b)
for i, elem in enumerate(range(var_b)):
    var_c = var_c * (var_a-i)
print(int(var_c))