Unable to create a simple win / loss chart

hey guys, I have a # of games played column (Column A), a # of games won column (Column B), and a number of games lost column (Column C)

I'm trying to make it so Column C automatically enters the number when I put in the number in Column B.

Example:

Games Played........Win........Loss
1.........................1...........0
2.........................1...........1
3.........................1...........2
4.........................2...........2

For the fifth game played, if I won it, how do i make the 2 to automatically enter into the loss column when I put in the number 3 in the win column?