#include <bits/stdc++.h>
#define rep(i,a,b) for(int i = (a); i < (b); i++)
#define all(A) (A).begin(),(A).end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;

int main(){
  int n,l; cin >> n >> l;
  int sum = 0, ans = 0;
  rep(i,0,n){
    int a; cin >> a;
    if(sum+a > l){
      sum -= a;
      ans++;
    } else sum += a;
  }
  if(sum > l) ans++;
  cout << ans;
}