#include <bits/stdc++.h>

using namespace std;

int main()
{
    ifstream in("euro.in");
    ofstream out("euro.out");

    int n, t;
    in >> n >> t;

    vector<int> euro(n);

    for (auto &v_i : euro)
    {
        in >> v_i;
    }

    int euro_crt = 0, lei_total = 0;

    for (int i = 0; i < n; i++)
    {
        euro_crt += euro[i];
        if (euro_crt < 0)
        {
            lei_total += euro_crt * (i + 1) - t;
            euro_crt = 0;
        }
    }

    lei_total += euro_crt * n - t;

    out << lei_total;

    return 0;
}