#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, w, ans = 0;
    cin >> n >> w;
    vector<int> a(n);
    for(auto &&v:a)cin >> v;
    set<int> S;
    for(int l = 0, r = 0, s = 0; l < n; l++){
        r = max(r, l);
        while(r < n && s + a[r] <= w && !S.count(a[r])){
            S.insert(a[r]);
            s += a[r++];
            ans = max(ans, r - l);
        }
        if(a[l] <= w){
            S.erase(a[l]);
            s -= a[l];
        }
    }
    cout << ans << '\n';
}