
def main():
    a, p = map(int, input().split())
    print((a * 3 + p) // 2)


if __name__ == "__main__":
    main() def main():
    a, p = map(int, input().split())
    print((a * 3 + p) // 2) main a, p = map(int, input().split()) a map(int, input().split()) map int input().split() ().split () input split p print((a * 3 + p) // 2) print (a * 3 + p) // 2 a * 3 + p a * 3 a 3 p 2 if __name__ == "__main__":
    main() __name__ == "__main__" __name__ "__main__" main() main def main():
    a, p = map(int, input().split())
    print((a * 3 + p) // 2) def main():
    a, p = map(int, input().split())
    print((a * 3 + p) // 2) main

def main():
    a, p = map(int, input().split())
    print((a * 3 + p) // 2)


if __name__ == "__main__":
    main()
