#include <bits/stdc++.h>
using namespace std;
#define io ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ALL(x) x.begin(),x.end()
#define SZ(x) x.size()
#define PB push_back
#define MP make_pair
#define F first
#define S second
typedef long long LL;
typedef vector<int> VI;
typedef pair<int,int> PI;

int n,w,x;
LL beg,now,ans=-1;

int main() {
   io;
   cin >> n >> w;
   for(int i = 0; i < n; i++) {
      cin >> x;
      now += x;
      if(now < 0) {
         beg += abs(now);
         ans += abs(now);
         now = 0;
      }
      ans = max(max(now, beg),ans);
      if(beg > w || now > w) {
         puts("0");
         exit(0);
      }
   }
   cout << w - ans + 1;
}