#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
using ll = long long;
using graph = vector<vector<int>>;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
vector<int> dh = {-1,0,1,0,-1,1,1,-1};
vector<int> dw = {0,1,0,-1,1,1,-1,-1};

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);

  int n, x; cin >> n >> x;  
  int ans = -x;
  rep(i, n) {
    int a; cin >> a;
    ans += a;
  }
  ans = max(0, ans);
  cout << ans << "\n";
  return 0;
}