#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream fin ("euro.in");
    int sum = 0,n,x,t;
    fin >> n >> t;
    int lei =0;
    for(int i=1;i<=n;++i)
    {
        fin >> x;
        sum+=x;
        if(sum<0){
            lei+=sum*i-t;
            sum=0;}


    }
    fin.close();
    lei+=sum*n-t;
    ofstream fout ("euro.out");
    fout << lei << "\n";
    fout.close();


    return 0;
}