Ankit, Srijan and a game of stone piles

There are N piles of stones, where i-th pile has Ai stones. A game is played on these piles, in order from pile 1 to N. When the game is on the i-th pile, a player can remove any non-zero number of stones from this pile in a single move. If the current pile becomes empty, the game moves on to the next pile. The player who is unable to make a move loses. Srijan and Ankit are going to play this gam