#include <bits/stdc++.h>
#define int long long
using namespace std;
 
const int nmax = 1e6;
int a[nmax + 5];
 
int32_t main() {
    int n, m; cin >> n >> m;
    for(int i = 1; i <= n; ++ i) cin >> a[i];
 
    int sum = 0, ans = -1;
    for(int l = 1, r = 1; r <= n; ++ r) {
        sum += a[r];
        if(sum >= m) ans = max(r - l + 1, ans);
        while(sum >= m) {
            sum -= a[l];
            ++ l;
        }
    }
    cout << ans;
}

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