local mmi, mma = math.min, math.max
local n, w = io.read("*n", "*n")
local t = {}
local a = {}
for i = 1, n do
  a[i] = io.read("*n")
end
local left = 1
local sum = 0
local ret = 0
for i = 1, n do
  local ai = a[i]
  if t[ai] then
    local newleft = t[ai] + 1
    for j = left, newleft - 1 do
      sum = sum - a[j]
      t[a[j]] = nil
    end
    left = newleft
  end
  t[ai] = i
  sum = sum + ai
  while w < sum do
    sum = sum - a[left]
    t[a[left]] = nil
    left = left + 1
  end
  ret = mma(ret, i - left + 1)
end
print(ret)