#include<cstdio> 
#include<iostream> 
#include<cmath> 
#include<algorithm> 
#include<cstring>
#define f(i,m,n) for(int i=m;i<=n;i++) 
using namespace std;
int a[100010],sum,ans=1; 
int main()
{
	int n,m;
	cin>>n>>m;
	f(i,1,n)
	cin>>a[i];
	f(i,1,n)
	 {
	 	sum+=a[i];
	 	if(sum==m)
	 	{
	 		sum=0;
	 		ans++;
		 }
		if(sum>m)
		{
			i--;
			sum=0;
			ans++;
		}
	 }
	cout<<ans; 
    return 0;
 }