Four in One Set by Tango

>The magician shows four half dollar coins in his hand. He takes a coin and puts it in his pocket. He shows the hand and has four coins again. He takes a coin once again and puts it in his pocket, but he has four coins again in his hand. He repeats this operation once again and he always has four coins in his hand. Finally, he show four coins in his hand, takes a coin and puts in his pocket, opens the hand and the rest of the coins have disappeared.