#include 
using namespace std;

int main()
{
  int n, m;
  cin >> n >> m;

  int niza[n];
  int pref_sums[n];
  int sum = 0;
  for(int i = 0; i < n; i++) {
    cin >> niza[i];
    
    sum += niza[i];
    pref_sums[i] = sum;
  }  
  int res = 0;
  for(int i = 0; i < n; i++) {
    int L = i + 1;
    int R = n - 1;

    while(L <= R) {
      int middle = (L + R) / 2;

      if(i == 0) {
          sum = pref_sums[middle];
      }
      else {
        sum = pref_sums[middle] - pref_sums[i - 1];
      }
      if(sum <= m) {
          res = max(res, middle - i + 1);
          L = middle + 1;
      }
      else {
        R = middle - 1;
      }
    }
  }
  cout << res << endl;

  return 0;
}