#include <fstream>

using namespace std;

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

long long euro[34569];


int main()
{
    int n,t,esum=0, lei = 0;
    fin>>n>>t;
    for(int i = 1; i <=n; i++)
    {
        fin>>euro[i];
        esum += euro[i];
        if(esum < 0)
        {
            lei += esum * i - t;
            esum = 0;
        }
    }
    if(esum>0)
        lei +=esum*n - t;
    fout<<lei;

    fin.close();
    fout.close();
    return 0;
}