Find number abc

A man is going skydiving for the first time. After listening to the instructor for what seems like days, he is ready to go.

The man goes up in the airplane and waits to get to the proper altitude. Excited, he jumps out of the airplane. After a bit, he pulls the ripcord. Nothing happens. He tries again. Still nothing. He starts to panic, but remembers his back-up chute. He pulls that cord. Nothing happens. He frantically begins pulling both cords, but to no avail.

Suddenly, he looks down and he can't believe his eyes. Another man is in the air with him, but this guy is going up! Just as the other guy passes by, the skydiver, by this time scared out of his wits, yells, "Hey, do you know anything about skydiving?" The other guy yells back, "No! Do you know anything about gas stoves?"