Problem: Write a program which manipulates a sequence $A$ = {$a_0, a_1, ..., a_{n-1}$} with the following operations:

* $update(s, t, x)$: change $a_s, a_{s+1}, ..., a_t$ to $x$.
* $getSum(s, t)$: print the sum of $a_s, a_{s+1}, ..., a_t$.



Note that the initial values of $a_i ( i = 0, 1, ..., n-1 )$ are 0.

Constraints

* $1 ≤ n ≤ 100000$
* $1 ≤ q ≤ 100000$
* $0 ≤ s ≤ t < n$
* $-1000 ≤ x ≤ 1000$

Input


$n$ $q$
$query_1$
$query_2$
:
$query_q$


In the first line, $n$ (the number of elements in $A$) and $q$ (the number of queries) are given. Then, $i$-th query $query_i$ is given in the following format:


0 $s$ $t$ $x$


or


1 $s$ $t$


The first digit represents the type of the query. '0' denotes $update(s, t, x)$ and '1' denotes $find(s, t)$.

Output

For each $getSum$ query, print the sum in a line.

Example

Input

6 7
0 1 3 1
0 2 4 -2
1 0 5
1 0 1
0 3 5 3
1 3 4
1 0 5


Output

-5
1
6
8

Solution (in CPP):

Solution:
#include <iostream>
#include <vector>

using namespace std;

template<typename T>
class LazySegTree {
public:
    explicit LazySegTree(int n, T init, T def) : N(calcN_(n)), def(def) {
        mVal.assign(2*N+1, init);
        mLazy.assign(2*N+1, 0);
        mDirty.assign(2*N+1, 0);
    }
    void update(int l, int r, T value){
        updateImpl_(l, r, value, 0, 0, N);
    }
    T get(int l, int r){
        return getImpl_(l, r, 0, 0, N);
    }
private:
    int calcN_(int n){
        int res = 1;
        while(res < n) res *= 2;
        return res;
    }
    void updateImpl_(int l, int r, T value, int idx, int rangeL, int rangeR){
        eval_(idx, rangeL, rangeR);
        if(r <= rangeL || rangeR <= l) return;
        if(l <= rangeL && rangeR <= r){
            setLazy_(idx, value);
            eval_(idx, rangeL, rangeR);
        } else {
            int rangeM = (rangeL+rangeR)/2;
            updateImpl_(l, r, value, 2*idx+1, rangeL, rangeM);
            updateImpl_(l, r, value, 2*idx+2, rangeM, rangeR);
            mVal[idx] = operate_(mVal[2*idx+1], mVal[2*idx+2]);
        }
    }
    void setLazy_(int idx, T value){
        mLazy[idx] = value;
        mDirty[idx] = 1;
    }
    T getImpl_(int l, int r, int idx, int rangeL, int rangeR){
        if(r <= rangeL || rangeR <= l) return def;
        eval_(idx, rangeL, rangeR);
        if(l <= rangeL && rangeR <= r) return mVal[idx];
        int rangeM = (rangeL+rangeR)/2;
        T a = getImpl_(l, r, 2*idx+1, rangeL, rangeM);
        T b = getImpl_(l, r, 2*idx+2, rangeM, rangeR);
        return operate_(a, b);
    }
    void eval_(int idx, int rangeL, int rangeR){
        if(!mDirty[idx]) return;
        mVal[idx] = (rangeR - rangeL) * mLazy[idx];
        if(idx < N-1){
            setLazy_(2*idx+1, mLazy[idx]);
            setLazy_(2*idx+2, mLazy[idx]);
        }
        mLazy[idx] = 0;
        mDirty[idx] = 0;
    }
    T operate_(T a, T b) const { return a + b; }
    const int N;
    const T def;
    vector<T> mVal; 
    vector<T> mLazy;
    vector<int> mDirty;
};

int main(){
    int n, q;
    while(cin >> n >> q){
        LazySegTree<int> seg(n, 0, 0);
        for(int i=0;i<q;i++){
            int c; cin >> c;
            if(c == 0){
                int s, t, x; cin >> s >> t >> x;
                seg.update(s, t+1, x);
            } else {
                int s, t; cin >> s >> t;
                cout << seg.get(s, t+1) << endl;
            }
        }
    }
}