#include <iostream>
using namespace std;
int pref_sum[100005];

int suma(int i, int j) {
    if(i == 0) {
        return pref_sum[j];
    }
    return pref_sum[j] - pref_sum[i - 1];
}
int main() {
    int n;
    cin >> n;
    int m;
    cin >> m;

    int niza[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 = 0, R = n - 1;
        int idx = -1;
        while(L <= R) {
            int mid = (L + R) / 2;
            int kolku_e_sumata = suma(i, mid);
            if(kolku_e_sumata <= m) {
                if(idx < mid) {
                    idx = mid;
                }
                L = mid + 1;
            }
            else {
                R = mid - 1;
            }
        }
        if(idx - i + 1 > res) {
            res = idx - i + 1;
        }
    }
    cout << res << endl;
    return 0;
}