Adding wins/Losses

I'm looking to add up all the wins and losses of games in a cell.

The positive scores B4, C4, E4 are all winning game.

While D4, F4 are losing games.

So, I'm looking for a formula that shows the game in Cells G4 and H4

Kevin should have a 3-2 record after 5 games and a running total of -4 (I4)