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

int main() {
    int n, p;
    cin >> n >> p;
    int a[n];
    int ossz = 0, ans = 0, ansmax = 0;
    int elozo = 0;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        ossz += a[i];
        ans++;
        while (ossz > p) {
            ossz -= a[elozo];
            elozo++;
            ans--;
        }
        ansmax = max(ans, ansmax);
    }

    cout << ansmax << endl;

}