from decimal import * try: while True: r = input().replace('\n', '') n = input().replace('\n', '') p = input().replace('\n', '') r = Decimal(r) n = int(n) p = Decimal(p) totle = p for x in range(n): totle = totle*(1+r) if x != n-1: totle += p print(int(totle)) except EOFError: pass