// Source: https://usaco.guide/general/io

#include <bits/stdc++.h>
#include <iostream>
#include <vector>
using namespace std;

int main() {
	int n, p;
	cin >> n >> p;
	int j = 0, maxi = 0;
	long long sum = 0;
	vector<int> b(n);
	for (int i = 0; i < n; i++) {
		int a;
		cin >> a;
		b[i] = a;
		sum += a;
		while (sum > p) {
			sum -= b[j];
			j++;
		}

		if (i - j + 1 > maxi) maxi = i - j + 1;
	}

	cout << maxi;
}