#include <iostream>
using namespace std;
int main() {
    int n, m;
    cin >> n >> m;

    int niza[n];

    int pref_sum[n];
    int sum = 0;
    for(int i = 0; i < n; i++) {
        cin >> niza[i];

        sum += niza[i];
        pref_sum[i] = sum;
    }
    int res = 0;
    for(int i = 0; i < n; i++) {
        int L = i, R = n - 1;
        int idx = -1;
        while(L <= R) {
            int middle = (L + R) / 2;

            if(i == 0) {
                sum = pref_sum[middle];
            }
            else {
                sum = pref_sum[middle] - pref_sum[i - 1];
            }

            if(sum <= m) {
                if(middle > idx) {
                    idx = middle;
                }
                L = middle + 1;
            }
            else {
                R = middle - 1;
            }

        }
        if(idx - i + 1 > res) {
            res = idx - i + 1;
        }
    }

   cout << res << endl;


    return 0;
}