Consider a game of countdown where two players mutually add to a sum starting at 1. The first player to add 300 or over loses! On their turn players may add (5,6, or 7) to the sum. For example, if Abby goes first and choose 5, then the sum is 6 and the game is passed to Becky who may choose to add 7 and get a sum of 13 which is passed back to Abby as the game continues. A) What is the first number (closest number to 300) for the sum at the beginning of your turn for which you can guarantee a win