#include 
#include 
using namespace std;
const int maxn = 2e5 + 10;
typedef long long ll;
ll pref_sum[maxn];

ll query(int i, int j) {
    if(i == 0) {
        return pref_sum[j];
    }
    return pref_sum[j] - pref_sum[i - 1];
}
int main() {
    ios_base::sync_with_stdio(false);
    int n;
    ll m;
    cin >> n >> m;
    
    vector v(n);
    ll sum = 0;
    for(int i = 0; i < n; i++) {
        cin >> v[i];
        sum += v[i];
        pref_sum[i] = sum;
    }
    int res = 0;
    for(int i = 0; i < n; i++) {
        int L = i, R = n - 1;
        int j = 0;
        while(L <= R) {
            int mid = (L + R) / 2;
            if(query(i, mid) <= m) {
                L = mid + 1;
                j = max(j, mid);
            }
            else {
                R = mid - 1;
            }
        }
        res = max(res, j - i + 1);
    }
    cout << res << endl;
    return 0;
}