#include <iostream>
#include <vector>

using namespace std;

int N, F, a, b, maxi, sum;

int main()
{
	cin >> N >> F;
	vector <int> x(N + 1, 0);

	for (int i = 1; i <= N; ++i)
		cin >> x[i];

	a = 1;
	sum = x[1];
	maxi = 0;

	for (b = 2; b <= N; ++b)
	{
		sum += x[b];
		while (sum > F)
		{
			sum -= x[a];
			++a;
		}

		if (b - a + 1 > maxi) maxi = b - a + 1;
	}

	cout << maxi << '\n';
	return 0;
}