#include <cassert>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <climits>
#include <map>
#include <queue>
#include <set>
#include <cstring>
#include <vector>

using namespace std;
typedef long long ll;

int main() {
  ll N, W;
  cin >> N >> W;

  ll A[N];
  for (int i = 0; i < N; ++i) {
    cin >> A[i];
  }

  int ans = 0;
  int left = 0;
  int right = 0;
  map<ll, int> counter;
  counter[A[0]]++;
  ll sum = A[0];

  while (left <= right) {
    if (sum <= W && counter[A[right]] <= 1) {
      ans = max(ans, right - left + 1);
    }

    if (right == N - 1) {
      counter[A[left]]--;
      sum -= A[left];
      ++left;
    } else if (counter[A[right]] >= 2) {
      counter[A[left]]--;
      sum -= A[left];
      ++left;
    } else if (left == right) {
      ++right;
      counter[A[right]]++;
      sum += A[right];
    } else if (sum > W) {
      counter[A[left]]--;
      sum -= A[left];
      ++left;
    } else {
      ++right;
      counter[A[right]]++;
      sum += A[right];
    }
  }

  cout << ans << endl;

  return 0;
}