import java.util.Arrays;
import java.util.HashMap;
import java.util.Scanner;

public class Main {
static long[] a=new long[1000005];
static long[] b=new long[1000005];
static int[] c=new int[200005];
static int[] d=new int[500005];
static int[] e=new int[200005];
static int[] f=new int[200005];
static int t=520;
static int ans=0;
static int max=-1;
static int min=(int)2e+9;
static int n=0;
static int m=0;
static int sum=0;
static int l=0;
static int r=0;

static HashMap<Integer,Integer> map=new HashMap<>();
public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    n=sc.nextInt();
    m=sc.nextInt();
    long l=m;
    long r=0;
    long sum=0;
    long max=0;
    long min=1000000005;
    for(int i=1;i<=n;i++) {
        sum+=sc.nextInt();
        if(sum>=0) {
            if(sum>=max) {
               l=m-sum;
               max=sum;
            }
        }
        else {
            if(sum<min) {
                   r=sum;
                   min=sum;
                }
        }
    }
    r=Math.abs(r);
    if(l>=r) {
        System.out.println(l-r+1);
    }
    else {
        System.out.println(0);
    }
}
}