#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n, w;
	cin >> n >> w;

	vector<int> a(n);
	for (auto&& it : a)
		cin >> it;

	int res{ 0 }, right{ 0 }, sum{ 0 };
	set<int> s;

	for (int left = 0; left < n; ++left)
	{
		while (right < n && !s.count(a[right]) && sum + a[right] <= w)
		{
			s.insert(a[right]);
			sum += a[right];
			++right;
		}

		res = max(res, right - left);
		if (left == right)
			++right;
		else
		{
			sum -= a[left];
			s.erase(a[left]);
		}
	}

	cout << res << "\n";

	return 0;
}