#include <bits/stdc++.h>
 
using namespace std;
 
#define DEBUG(x) cerr<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cerr<<#v<<":";for(int i=0;i<v.size();i++) cerr<<" "<<v[i]; cerr<<endl;
#define DEBUG_MAT(v) cerr<<#v<<endl;for(int i=0;i<v.size();i++){for(int j=0;j<v[i].size();j++) {cerr<<v[i][j]<<" ";}cerr<<endl;}
typedef long long ll;
// #define int ll
 
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
#define pll pair<ll,ll>
template<class S, class T> pair<S, T> operator+(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first + t.first, s.second + t.second); }
template<class S, class T> pair<S, T> operator-(const pair<S, T> &s, const pair<S, T> &t) { return pair<S, T>(s.first - t.first, s.second - t.second); }
template<class S, class T> ostream& operator<<(ostream& os, pair<S, T> p) { os << "(" << p.first << ", " << p.second << ")"; return os; }
#define X first
#define Y second
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--)
#define rrep1(i,n) for(int i=(int)(n);i>0;i--)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define in(x, a, b) (a <= x && x < b)
#define all(c) c.begin(),c.end()
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; }
#define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end());
const ll inf = 1000000001;
const ll INF = (ll)1e18 + 1;
const long double pi = 3.1415926535897932384626433832795028841971L;
#define Sp(p) cout<<setprecision(25)<< fixed<<p<<endl;
//int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
//int dx2[8] = { 1,1,0,-1,-1,-1,0,1 }, dy2[8] = { 0,1,1,1,0,-1,-1,-1 };
vi dx = {1, 0, -1, 0}, dy = {0, 1, 0, -1};
vi dx2 = { 1,1,0,-1,-1,-1,0,1 }, dy2 = { 0,1,1,1,0,-1,-1,-1 };
#define fio() cin.tie(0); ios::sync_with_stdio(false);
// const ll MOD = 1000000007;
const ll MOD = 998244353;
// #define mp make_pair
//#define endl '\n'


template <typename T>
class SegmentTree {
public:
  using F = function<T(T&, T&)>;
  int n;
  vector<T > dat;
  T e; // �P�ʌ�
  F query_func;
  F update_func;
  
  SegmentTree(vector<T> a, F query_func, F update_func, T e) :n(a.size()), query_func(query_func), update_func(update_func), e(e) {
    dat.resize(4 * n);
    init(0, 0, n, a);
  }

  void init(int k, int l, int r, vector<T> &a) {
    if (r - l == 1) {
      dat[k] = a[l];
    }
    else {
      int lch = 2 * k + 1, rch = 2 * k + 2;
      init(lch, l, (l + r) / 2, a);
      init(rch, (l + r) / 2, r, a);
      dat[k] = query_func(dat[lch], dat[rch]);
    }
  }

  //k�Ԗڂ̒l��a�ɕύX
  void update(int k, T a, int v, int l, int r) {
    if (r - l == 1) {
      dat[v] = update_func(dat[v], a);
    }
    else {
      if (k < (l + r) / 2)
        update(k, a, 2 * v + 1, l, (l + r) / 2);
      else {
        update(k, a, 2 * v + 2, (l + r) / 2, r);
      }
      dat[v] = query_func(dat[v * 2 + 1], dat[v * 2 + 2]);
    }
  }
    

  //[a,b)�̍ŏ��l�����߂�
  //���̂ق��̈����͌v�Z�̊ȒP�̂��߂̈���
  //k�͐ړ_�̔ԍ�,l,r�͂��̐ړ_��[l,r)�ɑΉ����Ă��邱�Ƃ�\��
  //�]���āA�O�����query(a,b,0,0,n)�Ƃ��Ă��
  T query(int a, int b, int k, int l, int r) {
    if (r <= a || b <= l) {
      return e;
    }
    if (a <= l && r <= b) {
      return dat[k];
    }
    else {
      T ul = query(a, b, k * 2 + 1, l, (l + r) / 2);
      T ur = query(a, b, k * 2 + 2, (l + r) / 2, r);
      return query_func(ul, ur);
    }
  }

  // �����𖞂����ĉE��T��
  int find(int a, int b, int k, int l, int r, int x) {
    // �����𒼂�
    if (dat[k] < x || r <= a || b <= l) return -1;
    if (l + 1 == r) {
      // �����𒼂�
      if (dat[k] >= x) return l;
      else return -1;
    }
    int rv = find(a, b, 2 * k + 2, (l + r) / 2, r, x);
    if (rv != -1) return rv;
    return find(a, b, 2 * k + 1, l, (l + r) / 2, x);
  }
};


pii f(pii a, pii b) {
    if (a.first == b.first) {
        return pii(a.first, a.second + b.second);
    }
    else {
        return min(a, b);
    }
}
pii g(pii, pii b) {return b;}



template< typename Semigroup >
struct DisjointSparseTable {
  using F = function< Semigroup(Semigroup, Semigroup) >;
  const F f;
  vector< vector< Semigroup > > st;

  DisjointSparseTable(const vector< Semigroup > v, const F f) : f(f) {

    int b = 0;
    while((1 << b) <= v.size()) ++b;
    st.resize(b, vector< Semigroup >(v.size(), Semigroup()));
    for(int i = 0; i < v.size(); i++) st[0][i] = v[i];
    for(int i = 1; i < b; i++) {
      int shift = 1 << i;
      for(int j = 0; j < v.size(); j += shift << 1) {
        int t = min(j + shift, (int) v.size());
        st[i][t - 1] = v[t - 1];
        for(int k = t - 2; k >= j; k--) st[i][k] = f(v[k], st[i][k + 1]);
        if(v.size() <= t) break;
        st[i][t] = v[t];
        int r = min(t + shift, (int) v.size());
        for(int k = t + 1; k < r; k++) st[i][k] = f(st[i][k - 1], v[k]);
      }
    }
  }

  Semigroup query(int l, int r) {
    if(l >= --r) return st[0][l];
    int p = 31 - __builtin_clz(l ^ r);
    return f(st[p][l], st[p][r]);
  }
};


signed main() {
    fio();    

    int n, k;
    cin >> n >> k;
    vi a(n);
    vector<pii> temp(n);
    map<int, int> last_idx;
    rep (i, n) {
        cin >> a[i];
        temp[i].first = a[i];
        temp[i].second = 1;
        last_idx[a[i]] = inf;
    }

    // SegmentTree<pii> seg(temp, f, g, pii(inf, 0));
    DisjointSparseTable<pii> seg(temp, f);

    vi next_idx(n);
    rrep (i, n) {
        next_idx[i] = last_idx[a[i]];
        last_idx[a[i]] = i;
    }

    ll ans = 0;
    for (auto iiitr = last_idx.begin(); iiitr != last_idx.end(); iiitr++) {
        ll x = iiitr->first;
        ll y = k - x;
        if (last_idx.count(y) == 0) continue;

        pll now(0, 0);
        int pre = -1;
        int li = last_idx[x], ri = last_idx[y];
        using P = pair<int, pll>;
        set<P> one, two;
        while (li != inf or ri != inf) {
            int ni;
            if (li <= ri) {
                ni = li;
            }
            else {
                ni = ri;
            }

            // pii mi = seg.query(pre + 1, ni + 1, 0, 0, seg.n);
            pll mi = seg.query(pre + 1, ni + 1);
            P add1(mi.first, pii(0, 0)), add2(mi.first, pii(0, 0));
            auto itr = one.end();
            while (true) {
                if (itr == one.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                if (mi.second > 1) {
                    add2.second.first += itr->second.first;
                    add2.second.second += itr->second.second;
                }
                else {
                    if (mi.first == itr->first) {
                        add2.second.first += itr->second.first;
                        add2.second.second += itr->second.second;
                    }
                    else {
                        add1.second.first += itr->second.first;
                        add1.second.second += itr->second.second;
                    }
                }
                now.first -= itr->second.first;
                now.second -= itr->second.second;
                // one.erase(itr);
            }
            while (true) {
                auto itr = one.end();
                if (itr == one.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                one.erase(itr);
            }
            
            itr = two.end();
            while (true) {
                if (itr == two.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                if (mi.second > 1) {
                    add2.second.first += itr->second.first;
                    add2.second.second += itr->second.second;
                }
                else {
                    if (mi.first == itr->first) {
                        add2.second.first += itr->second.first;
                        add2.second.second += itr->second.second;
                    }
                    else {
                        add1.second.first += itr->second.first;
                        add1.second.second += itr->second.second;
                    }
                }
                // two.erase(itr);
            }
            while (true) {
                auto itr = two.end();
                if (itr == two.begin()) break;
                itr--;
                if (itr->first < mi.first) break;
                two.erase(itr);
            }

            now.first += add1.second.first;
            now.second += add1.second.second;
            if (add1.second.second > 0) one.insert(add1);
            if (add2.second.second > 0) two.insert(add2);

            if (ni == li) {
                P add(x, pii(ni, 1));
                now.first += ni;
                now.second += 1;
                auto itr = one.lower_bound(P(x, pll(-INF, -INF)));
                if (itr->first == x) {
                    add.second.first += itr->second.first;
                    add.second.second += itr->second.second;
                    one.erase(itr);
                }
                one.insert(add);
                li = next_idx[li];
            }
            else {
                ans += -now.first + now.second * (ri + 1);
                ri = next_idx[ri];
            }

            pre = ni;
        }
    }
    cout << ans << endl;
}