#include <bits/stdc++.h>
using namespace std;
//#include <boost/multiprecision/cpp_int.hpp>
//using multiInt = boost::multiprecision::cpp_int;

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
template <typename Q_temp>
using smaller_queue = priority_queue<Q_temp, vector<Q_temp>, greater<Q_temp>>;

const ll MOD = (ll)(1e9 + 7);
const int INF = (int)1e9;
const ll LINF = (ll)4e18;
const double PI = acos(-1.0);

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << endl
#define Yes(n) cout << ((n) ? "Yes" : "No") << endl
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << endl
#define possible(n) cout << ((n) ? "possible" : "impossible") << endl
#define Yay(n) cout << ((n) ? "Yay!" : ":(") << endl
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << endl;

vector<int> Dx = {0, 0, -1, 1, -1, 1, -1, 1, 0};
vector<int> Dy = {1, -1, 0, 0, -1, -1, 1, 1, 0};

template <typename T, typename E>
struct SegmentTree
{
  typedef function<T(T, T)> F;
  typedef function<T(T, E)> G;
  typedef function<E(E, E)> H;
  typedef function<E(E, int)> P;
  int n;
  F f;
  G g;
  H h;
  P p;
  T d1;
  E d0;
  vector<T> dat;
  vector<E> laz;
  SegmentTree(int n_, F f, G g, H h, T d1, E d0,
              vector<T> v = vector<T>(), P p = [](E a, int b) { return a; }) : f(f), g(g), h(h), d1(d1), d0(d0), p(p)
  {
    init(n_);
    if (n_ == (int)v.size())
      build(n_, v);
  }
  void init(int n_)
  {
    n = 1;
    while (n < n_)
      n *= 2;
    dat.clear();
    dat.resize(2 * n - 1, d1);
    laz.clear();
    laz.resize(2 * n - 1, d0);
  }
  void build(int n_, vector<T> v)
  {
    for (int i = 0; i < n_; i++)
      dat[i + n - 1] = v[i];
    for (int i = n - 2; i >= 0; i--)
      dat[i] = f(dat[i * 2 + 1], dat[i * 2 + 2]);
  }
  inline void eval(int len, int k)
  {
    if (laz[k] == d0)
      return;
    if (k * 2 + 1 < n * 2 - 1)
    {
      laz[k * 2 + 1] = h(laz[k * 2 + 1], laz[k]);
      laz[k * 2 + 2] = h(laz[k * 2 + 2], laz[k]);
    }
    dat[k] = g(dat[k], p(laz[k], len));
    laz[k] = d0;
  }
  T update(int a, int b, E x, int k, int l, int r)
  {
    eval(r - l, k);
    if (r <= a || b <= l)
      return dat[k];
    if (a <= l && r <= b)
    {
      laz[k] = h(laz[k], x);
      return g(dat[k], p(laz[k], r - l));
    }
    return dat[k] = f(update(a, b, x, k * 2 + 1, l, (l + r) / 2),
                      update(a, b, x, k * 2 + 2, (l + r) / 2, r));
  }
  T update(int a, int b, E x)
  {
    return update(a, b, x, 0, 0, n);
  }
  T query(int a, int b, int k, int l, int r)
  {
    eval(r - l, k);
    if (r <= a || b <= l)
      return d1;
    if (a <= l && r <= b)
      return dat[k];
    T vl = query(a, b, k * 2 + 1, l, (l + r) / 2);
    T vr = query(a, b, k * 2 + 2, (l + r) / 2, r);
    return f(vl, vr);
  }
  T query(int a, int b)
  {
    return query(a, b, 0, 0, n);
  }
};

int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << setprecision(20) << setiosflags(ios::fixed);
  int n, q;
  cin >> n >> q;
  SegmentTree<ll, ll> sg(
      n + 1,
      [](ll a, ll b) { return a + b; },
      [](ll a, ll b) { return a + b; },
      [](ll a, ll b) { return a + b; },
      0, 0, vector<ll>(n + 1, 0),
      [](ll a, ll b) { return a * b; });
  rep(_, q)
  {
    int type;
    cin >> type;
    if (type == 0)
    {
      ll s, t, x;
      cin >> s >> t >> x;
      sg.update(s, t + 1, x);
    }
    else
    {
      int s, t;
      cin >> s >> t;
      cout << sg.query(s, t + 1) << endl;
    }
  }
  return 0;
}



Measured memory_bytes: 8668