#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
#define debug(x) std::cout << #x << ": " << x << '\n';
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    int n, w;
    cin >> n >> w;
    vector <int> a(n), pref(n + 1);
    map <int, int> last;
    int r = -1, ans = 0;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        pref[i + 1] = pref[i] + a[i];
        if (last.count(a[i])) {
            r = max(r, last[a[i]]);
        }   
        last[a[i]] = i;
        ans = max(ans, i + 1 - max((int)(lower_bound(pref.begin(), pref.begin() + i + 1, pref[i + 1] - w) - pref.begin()), r + 1));        
    }   
    cout << ans << endl;
}