The Dead elevator-Brain Teasers

An elevator is on the ground floor. There are four people in the elevator, including me. When the elevator reaches the first floor, one person gets out and three people get in. The elevator goes up to the second floor. Two people get out and six people get in. It then goes to the next floor up. No one gets out, but 12 people get in. Halfway up to the next floor, the cable snaps, and the elevator crashes to the floor. Everyone else dies in the lift. How did I survive?