Bernardo and Silvia play the following game. An integer between 1 and 699, inclusive, is selected and given to Bernardo. Whenever Bernardo receives a number, he adds 15 to it and passes the result to Silvia. Whenever Silvia receives a number, she doubles it and passes the result to Bernardo. The winner is the last person who produces a number less than 700. Let $N$ be the smallest initial number that results in a win for Bernardo. What is the sum of the digits of $N$?