// Source: https://usaco.guide/general/io

#include <algorithm>
#include <bits/stdc++.h>
using namespace std;

#define int int64_t

int32_t main() {
	int n , m; cin >> n >> m;
    vector<int> a;
    int l = -1 , c = 0 , ans = 0;
    for(int r = 0;r < n; r++){
        int x; cin >> x;
        c+=x;
        a.push_back(x);
        while(c > m){
            l++;
            c-=a[l];
        }
        ans = max(ans , r-l);
    }
    cout << ans << endl;
}