#include <bits/stdc++.h>   
#define rep(i, n) for(long long int i = 0; i < n; i++)
#define _rep(i, m, n) for(long long int i = m; i < n; i++)
using namespace std;
typedef long long ll;
typedef pair<int, int> P;
const ll mod = 1000000007;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
     
ll gcd(ll A, ll B){
    if(B == 0)return A;
    return gcd(B, A % B);
}
ll lcm(ll A, ll B){
    return A * B / gcd(A, B);
}
using Graph = vector<vector<int>>;
Graph G;

int main(){
    int n; cin >> n;
    ll x; cin >> x;
    vector<ll> a(n);
    rep(i, n) cin >> a[i];

    ll ans = 0;
    _rep(i, 1, n){
        if(a[i - 1] > x){
            ans += a[i - 1] - x;
            ans += a[i];
            a[i] = 0;
        }else if(a[i - 1] + a[i] > x){
            ans += (a[i - 1] + a[i] - x);
            a[i] = x - a[i - 1];
        }
    }
    cout << ans << endl;
}
// This template belongs to Juan Carlo Vieri

/*   ____   __
    /  _/  |  |    __         __
 __|  |__  |  |   /_/        |  |
|__    __| |  |   __    ____ |  | __   ___   _  ___
   |  |    |  |  |  |  /  _/ |  |/ /  / _ \ | |/ _/
   |  |    |  |  |  | |  |_  |     \ |  __/ |   /
   |__|    |__|  |__|  \___\ |__|\__\ \___\ |__|
*/

#include <bits/stdc++.h>
using namespace std;

typedef int_fast64_t ll;
typedef long double ld;
typedef int_fast64_t intt;
typedef int_fast32_t tmp_m;
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#define from(x, y, arr) (arr[y] - ((x > 0) ? (arr[x - 1]) : (0)))
#define min(a, b) (a > b ? b : a)
#define max(a, b) (a <  b ? b : a)
#define puts(x) cout << x << endl
#define deb(x) cout << #x << ' ' << x << endl
#define rep(i, cmp1, cmp2) for (tmp_m i = (tmp_m)cmp1; i < (tmp_m)cmp2; ++i)
#define repp(i, cmp1, cmp2) for (tmp_m i = (tmp_m)cmp1; i >= (tmp_m)cmp2; --i)
#define pb push_back
#define st stack
#define pa pair
#define vc vector
#define qu queue
#define pq priority_queue
#define fr first
#define sc second
#define mp map
const ld pi = acos(-1.0);
const intt mod = 1e9 + 7;

struct pr {
  intt x;
  intt y;
  intt dst;
  pr() {}
  pr(intt x, intt y, intt dst) : x(x), y(y), dst(dst) {}
  inline bool operator<(const pr& cmp2) const {
    if (dst != cmp2.dst) return dst < cmp2.dst;
    if (x != cmp2.x) return x < cmp2.x;
    return y < cmp2.y;
  }
  inline bool operator==(const pr& cmp2) const {
    return (cmp2.dst == dst) && (cmp2.x == x) && (cmp2.y == y);
  }
  inline bool operator>(const pr& cmp2) const {
    if (dst != cmp2.dst) return dst > cmp2.dst;
    if (x != cmp2.x) return x > cmp2.x;
    return y > cmp2.y;
  }
};

struct point {
  intt x;
  intt y;
  point() {}
  point(intt x, intt y) : x(x), y(y) {}
  inline bool operator<(const point& cmp2) const {
    if (cmp2.x != x) return cmp2.x < x;
    return cmp2.y < y;
  }
  inline bool operator==(const point& cmp2) const {
    return (cmp2.x == x) && (cmp2.y == y);
  }
  inline bool operator>(const point& cmp2) const {
    if (cmp2.x != x) return cmp2.x > x;
    return cmp2.y > y;
  }
};

namespace std {

template<typename T>
struct hash<vector<T> > {
  size_t operator()(const vector<T>& k) const {
    size_t ret = 0xf3ee477d;
    for (size_t i = 0; i != k.size(); ++ i)
      ret ^= hash(hash(k[i]) + i);
    return ret;
  }
};

template<>
struct hash<pr>{
  size_t operator()(const pr& cmp1) const {
    return (hash<intt>()(cmp1.x)) ^ (hash<intt>()(cmp1.y)) ^
           (hash<intt>()(cmp1.dst));
  }
};

template<>
struct hash<point>{
  size_t operator()(const point& cmp1) const {
    return (hash<intt>()(cmp1.x)) ^ (hash<intt>()(cmp1.y));
  }
};
}

inline bool spoint(const point& cmp1, const point& cmp2) {
  // swap(cmp1, cmp2);
  if (cmp1.x != cmp2.x) return cmp1.x < cmp2.x;
  return cmp1.y < cmp2.y;
}

inline bool spr(const pr& cmp1, const pr& cmp2) {
  // swap(cmp1, cmp2);
  if (cmp1.dst != cmp2.dst) return cmp1.dst < cmp2.dst;
  if (cmp1.x != cmp2.x) return cmp1.x < cmp2.x;
  return cmp1.y < cmp2.y;
}

void sub() {
  
}

void solve() {
  // intt t; cin >> t;
  // while (t--) sub();
  intt n;
  cin >> n;
  vc<intt> arr(n);
  intt nol = 0;
  intt neg = 0;
  rep(i, 0, n){
    cin >> arr[i];
    if(arr[i] == 0)nol = 1;
    if(arr[i] < 0)++neg;;
  } 
  if(neg % 2 == 0 || nol){
    intt ans = 0;
    rep(i, 0, n){
      ans += abs(arr[i]);
    }
    cout << ans << endl;
    return;
  } else{
    rep(i, 0, n){
      arr[i] = abs(arr[i]);
    }
    sort(arr.begin(), arr.end());
    intt ans = -(arr[0]);
    rep( i, 1, n){
      ans += arr[i];
    }
    cout << ans << endl;
  }
}

void init() {
  // remove if interactive
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  srand(time(0));
  // memset(dp, -1, sizeof dp);
}

int main() {
  init();
  solve();
  return 0;
}
