def max_polygons(n, x, a)
  l, t, m = 0, 0, 0
  for r in 0...n
    t += a[r]
    while t > x
      t -= a[l]
      l += 1
    end
    m = [m, t].max
  end
  m
end

n, x = gets.split.map(&:to_i)
a = gets.split.map(&:to_i)

puts max_polygons(n, x, a)