Little Johnny was in Math class and it was his turn to answer a math problem.
"If I gave you 3 dogs on Monday, 1 dog on Wednesday, and 2 dogs on Saturday, how many dogs would you have?" asked Johnny's teacher.
"Seven!" shouted Johnny.
"Now wait a minute Johnny, you need to think it through" said the teacher. "Listen, if I gave you 3 dogs on Monday, 1 dog on Wednesday, and 2 dogs on Saturday, how many dogs would you have?"
"SEVEN!" shouted Johnny.
"Listen Johnny! Just take the numbers-3 + 1 + 2. Now if I gave you all those dogs, how many dogs would you have?
"Still seven!" insisted Johnny. "I already have a dog at home!"