#include <iostream>
#include <vector>

using namespace std;

int main() {

    int n;
    long long m;
    cin >> n >> m;

    vector<int> a(n);
    for (int &x : a) cin >> x;

    long long pref_suma = 0;
    int l = 0;
    int resenje = 0;

    for (int d = 0; d < n; d++) {
        pref_suma += a[d];

        while (pref_suma > m) {
            pref_suma -= a[l];
            l++;
        }

        int novo = d - l + 1;
        if(novo > resenje) resenje = novo;
    }

    cout << resenje << endl;

    return 0;
}