#include"testlib.h"
#include<iostream>
#include<vector>
#include<string>
#include<map>
#include<set>
#include<queue>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<random>
#include<stdio.h>
using namespace std;

typedef long long ll;
const long long MIN_N = 2;
const long long MAX_N = 100000;
const long long MIN_K = 1;
const long long MAX_K = 100000;

void validate(){

  long long N = inf.readLong(MIN_N,MAX_N,"N");
  inf.readSpace();
  long long K = inf.readLong(MIN_K,MAX_K,"K");
  inf.readEoln();
  long long S = 0;
  long long a = 0;
  for (long long i=0;i<N;i++){
    a = inf.readLong(-K,K);
    if (i!=0){
      if (S < a){
        inf.readEof();
      }
    }
    S += a;
    if (i!=N-1){
      inf.readSpace();
    }
    else{
      inf.readEoln();
    }
  }
  inf.readEof();
}

int main(int argc, char* argv[]){
  registerValidation(argc,argv);
  validate();
}