#include <bits/stdc++.h>

using namespace std;
ifstream fin ("euro.in");
ofstream fout ("euro.out");

long long n, t;
long long lei, euro, val;

int main()
{
    fin >> n >> t;
    for(int i = 1 ; i <= n ; i++)
    {
        fin >> val;
        euro += val;
        if(euro < 0)
        {
            lei += (euro * i - t);
            euro = 0;
        }
    }
    if(euro != 0)
    {
        lei += (euro * n - t);
    }
    fout << lei;
    return 0;
}