#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, kol = 0, sum = 0, a;
  cin >> n >> m;
  for (int i = 0; i < n; i++) {
    cin >> a;
    if (sum + a > m) {
      kol++;
      sum = a;
    } else
      sum += a;
  }
  cout << kol + 1;
}
