#include<bits/stdc++.h>

using namespace std;

template< class Monoid, class OperatorMonoid = Monoid >
struct RandomizedBinarySearchTree
{
  using F = function< Monoid(Monoid, Monoid) >;
  using G = function< Monoid(Monoid, OperatorMonoid) >;
  using H = function< OperatorMonoid(OperatorMonoid, OperatorMonoid) >;
  using P = function< OperatorMonoid(OperatorMonoid, int) >;

  inline int xor128()
  {
    static int x = 123456789;
    static int y = 362436069;
    static int z = 521288629;
    static int w = 88675123;
    int t;

    t = x ^ (x << 11);
    x = y;
    y = z;
    z = w;
    return w = (w ^ (w >> 19)) ^ (t ^ (t >> 8));
  }

  struct Node
  {
    Node *l, *r;
    int cnt;
    Monoid key, sum;
    OperatorMonoid lazy;

    Node() {}

    Node(const Monoid &k, const OperatorMonoid &p) : cnt(1), key(k), sum(k), lazy(p), l(nullptr), r(nullptr) {}
  };

  vector< Node > pool;
  int ptr;

  const Monoid M1;
  const OperatorMonoid OM0;
  F f;
  G g;
  H h;
  P p;


  RandomizedBinarySearchTree(int sz, const F &f, const Monoid &M1) :
      pool(sz), ptr(0), f(f), g(f), h(f), p(f), M1(M1), OM0(0) {}

  RandomizedBinarySearchTree(int sz, const F &f, const G &g, const H &h, const P &p,
                             const Monoid &M1, const OperatorMonoid &OM0) :
      pool(sz), ptr(0), f(f), g(g), h(h), p(p), M1(M1), OM0(OM0) {}

  inline Node *alloc(const Monoid &key) { return &(pool[ptr++] = Node(key, OM0)); }

  virtual Node *clone(Node *t) { return t; }

  inline int count(const Node *t) { return t ? t->cnt : 0; }

  inline Monoid sum(const Node *t) { return t ? t->sum : M1; }

  inline Node *update(Node *t)
  {
    t->cnt = count(t->l) + count(t->r) + 1;
    t->sum = f(f(sum(t->l), sum(t->r)), t->key);
    return t;
  }

  Node *propagete(Node *t)
  {
    t = clone(t);
    if(t->lazy != OM0) {
      t->key = g(t->key, t->lazy);
      if(t->l) {
        t->l = clone(t->l);
        t->l->lazy = h(t->l->lazy, t->lazy);
        t->l->sum = f(t->l->sum, p(t->lazy, count(t->l)));
      }
      if(t->r) {
        t->r = clone(t->r);
        t->r->lazy = h(t->r->lazy, t->lazy);
        t->r->sum = f(t->r->sum, p(t->lazy, count(t->r)));
      }
      t->lazy = OM0;
    }
    return update(t);
  }

  Node *merge(Node *l, Node *r)
  {
    if(!l || !r) return l ? l : r;
    if(xor128() % (l->cnt + r->cnt) < l->cnt) {
      l = propagete(l);
      l->r = merge(l->r, r);
      return update(l);
    } else {
      r = propagete(r);
      r->l = merge(l, r->l);
      return update(r);
    }
  }

  pair< Node *, Node * > split(Node *t, int k)
  {
    if(!t) return {t, t};
    t = propagete(t);
    if(k <= count(t->l)) {
      auto s = split(t->l, k);
      t->l = s.second;
      return {s.first, update(t)};
    } else {
      auto s = split(t->r, k - count(t->l) - 1);
      t->r = s.first;
      return {update(t), s.second};
    }
  }

  Node *build(int l, int r, const vector< Monoid > &v)
  {
    if(l + 1 >= r) return alloc(v[l]);
    return merge(build(l, (l + r) >> 1, v), build((l + r) >> 1, r, v));
  }

  Node *build(const vector< Monoid > &v)
  {
    ptr = 0;
    return build(0, (int) v.size(), v);
  }

  void dump(Node *r, typename vector< Monoid >::iterator &it)
  {
    if(!r) return;
    r = propagete(r);
    dump(r->l, it);
    *it = r->key;
    dump(r->r, ++it);
  }

  vector< Monoid > dump(Node *r)
  {
    vector< Monoid > v((size_t) count(r));
    auto it = begin(v);
    dump(r, it);
    return v;
  }

  string to_string(Node *r)
  {
    auto s = dump(r);
    string ret;
    for(int i = 0; i < s.size(); i++) ret += ", ";
    return (ret);
  }

  void insert(Node *&t, int k, const Monoid &v)
  {
    auto x = split(t, k);
    t = merge(merge(x.first, alloc(v)), x.second);
  }

  void erase(Node *&t, int k)
  {
    auto x = split(t, k);
    t = merge(x.first, split(x.second, 1).second);
  }

  Monoid query(Node *&t, int a, int b)
  {
    auto x = split(t, a);
    auto y = split(x.second, b - a);
    auto ret = sum(y.first);
    t = merge(x.first, merge(y.first, y.second));
    return ret;
  }

  void set_propagate(Node *&t, int a, int b, OperatorMonoid &p)
  {
    auto x = split(t, a);
    auto y = split(x.second, b - a);
    y.first->lazy = h(y.first->lazy, p);
    t = merge(x.first, merge(propagete(y.first), y.second));
  }

  void set_element(Node *&t, int a, int b, Monoid &p)
  {
    auto x = split(t, a);
    auto y = split(x.second, b - a);
    y.first->key = y.first->sum = p;
    t = merge(x.first, merge(propagete(y.first), y.second));
  }
};

using int64 = long long;

int main()
{
  int N, Q;
  scanf("%d %d", &N, &Q);
  auto add = [&](int64 x, int64 y) { return x + y; };
  auto mul = [&](int64 x, int64 y) { return x * y; };
  RandomizedBinarySearchTree< int64 > beet(N + Q, add, add, add, mul, 0, 0);
  auto root = beet.build(vector< int64 >(N));
  while(Q--) {
    int T;
    scanf("%d", &T);
    if(T == 0) {
      int s, t;
      int64 x;
      scanf("%d %d %lld", &s, &t, &x);
      beet.set_propagate(root, --s, t, x);
    } else {
      int s, t;
      scanf("%d %d", &s, &t);
      printf("%lld\n", beet.query(root, --s, t));
    }
  }
}


Measured memory_bytes: 8424