A teacher was inspired one morning at starbucks because the person in front of her paid for her coffee. She challenged her student to participate in a "pay it forward" challenge to help spread kindness. Each of the 24 students are the complete 3 acts of kindness in week one. As they complete the act, they ask those 3 people to do the same for 3 additional people in week two, and the pattern continues every week. How many acts of kindness were completed after 8 weeks?