def sgets = gets.strip
def get_int = Integer(sgets)
def get_list = sgets.split
def get_int_list = get_list.map { Integer(_1) }
def puts_yn(b) = puts(b ? 'Yes' : 'No')

n, x = get_int_list
a = get_int_list
d = a.sum - x
puts [d, 0].min