#include <bits/stdc++.h>
using namespace std;
const int MAXN = 100000 + 50;
struct node {
  int l, r, c, ctag, sz;
  long long ans, atag;
} tr[MAXN * 4];
void upp(int p) {
  if (tr[(p << 1)].c == tr[((p << 1) | 1)].c)
    tr[p].c = tr[(p << 1)].c;
  else
    tr[p].c = -1;
  tr[p].ans = tr[(p << 1)].ans + tr[((p << 1) | 1)].ans;
}
void dwn(int p) {
  if (tr[p].l == tr[p].r) return;
  int ctag = tr[p].ctag;
  long long atag = tr[p].atag;
  tr[p].atag = tr[p].ctag = 0;
  if (ctag) {
    tr[(p << 1)].c = tr[((p << 1) | 1)].c = ctag;
    tr[(p << 1)].ctag = tr[((p << 1) | 1)].ctag = ctag;
  }
  if (atag) {
    tr[(p << 1)].atag += atag;
    tr[((p << 1) | 1)].atag += atag;
    tr[(p << 1)].ans += tr[(p << 1)].sz * atag;
    tr[((p << 1) | 1)].ans += tr[((p << 1) | 1)].sz * atag;
  }
}
void build(int p, int l, int r) {
  tr[p].l = l;
  tr[p].r = r;
  tr[p].c = -1;
  tr[p].sz = r - l + 1;
  if (l == r) {
    tr[p].c = l;
    return;
  }
  int mid = (l + r) >> 1;
  build((p << 1), l, mid);
  build(((p << 1) | 1), mid + 1, r);
}
void change(int p, int x, int y, int v) {
  dwn(p);
  int l = tr[p].l, r = tr[p].r;
  if (l == x && y == r && tr[p].c != -1) {
    long long t = abs(tr[p].c - v);
    tr[p].ans += tr[p].sz * t;
    tr[p].atag += t;
    tr[p].c = tr[p].ctag = v;
    return;
  }
  int mid = (r + l) >> 1;
  if (y <= mid)
    change((p << 1), x, y, v);
  else if (mid < x)
    change(((p << 1) | 1), x, y, v);
  else {
    change((p << 1), x, mid, v);
    change(((p << 1) | 1), mid + 1, y, v);
  }
  upp(p);
}
long long qrysum(int p, int x, int y) {
  dwn(p);
  int l = tr[p].l, r = tr[p].r;
  if (l == x && y == r) return tr[p].ans;
  int mid = (r + l) >> 1;
  if (y <= mid)
    return qrysum((p << 1), x, y);
  else if (mid < x)
    return qrysum(((p << 1) | 1), x, y);
  else
    return qrysum((p << 1), x, mid) + qrysum(((p << 1) | 1), mid + 1, y);
}
int main() {
  int n, m;
  scanf("%d%d", &n, &m);
  build(1, 1, n);
  for (int i = 1, op, x, y, z; i <= m; i++) {
    scanf("%d%d%d", &op, &x, &y);
    if (op == 1) scanf("%d", &z), change(1, x, y, z);
    if (op == 2) printf("%lld\n", qrysum(1, x, y));
  }
  return 0;
}
