#include <iostream>
using namespace std;
unsigned long long C,a[1001],k;
int n,M;
int main()
{
cin >> n >> C;
for(int i=1;i<=n;i++)
cin >> a[i];
for(int i=1;i<=n;i++)
{
if(n==i and k+a[i]>C)
{
M++;
k=0;
}
if(k+a[i]<=C) k+=a[i];
if(n!=i and k+a[i+1]>C)
{
M++;
k=0;
}
if(n==i and k<=C) M++;
}
cout << M;
return 0;
}