#include<bits/stdc++.h>
using namespace std;
int main()
{
	unsigned long long a,b,c=0,d,s=0;
	cin>>a>>b;
	for(long long i=1;i<=a;i++){
		cin>>d;
		c+=d;
		if(c>=b){c=0;s++;}
	}
	cout<<s;
    return 0;
}