#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n, m, a, kh=0, b, megt = 0;;
    bool t=0;
    set<int> s;
    cin >> n >> m;
    while(n--)
    {
        cin >> a;
        if(t && a>b ||  kh+a>m || s.count(a))
        {
            megt+=s.size()-1;
            t = 0;
            kh = a;
            s.clear();
        }
        else
        {
            if(a < b)t=1;
            kh+=a;
        }
        b = a;
        s.insert(a);
    }
    cout << ++megt;
    return 0;
}