#include<iostream>
#include<cstdio>
#include<cstring>
#define MAX 2501
using namespace std;

int N,Ans;
int M,F[MAX],G[MAX];

void zuixiaodaijia()
{
    int min;
    F[1]=G[1]+G[0];
    for (int i=2;i<=N;i++)
    {
        min=0x7fffff;
        for (int k=0;k<=i-1;k++)
        {
            if (F[k]+G[i-k]+G[0]<min)
                min=F[k]+G[i-k]+G[0];
        }
        F[i]=min;
    }
    Ans=F[N]-G[0];
}

int main()
{
    freopen("cowriver.in","r",stdin);
    freopen("cowriver.out","w",stdout);
    cin >> N >> G[0];
    for (int i=1;i<=N;i++)
    {
        cin >> M;
        G[i]=G[i-1]+M;
    }

    zuixiaodaijia();
    cout << Ans << endl;
    return 0;
}