Adding an item to a stack at random in Python 3

This is the code I have for the issue. I need to use a random number to add one item to a stack 60% of the time and remove something from the stack 40% of the time and I need to keep track of successful adds and unsuccessful removals.

for i in range(100):
    ran = random.randint
    random_number = ran
    s = 0
    us = 0
if random_number < 60:
    ll.add()
    s += 1

elif random_number > 60:
    ll.remove_last()
    us += 1