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

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

if __name__ == '__main__':
    solve()
