#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N = 1e5+10;

int a[N],n,m;
int add[N*4];
int t[N*4];

inline void pushdown(int k,int l,int r,int mid){
    if(!add[k]) return;
    
    t[k*2] += (mid-l+1)*add[k];
    add[k*2] += add[k];
    
    t[k*2+1] += (r-mid)*add[k];
    add[k*2+1] += add[k];
    
    add[k] = 0;
} 

inline void build(int k,int l,int r){
    if(l == r){
        t[k] = a[l];
        return ;
    }
    
    int mid = l + r >> 1;
    build(k*2,l,mid);
    build(k*2+1,mid+1,r);
    
    t[k] = t[k*2]+t[k*2+1];
}

inline void update(int k,int l,int r,int x,int y,int v){
    if(l == r){
        t[k] += (r-l+1)*v;
        add[k] += v;
        return ;
    }
    
    int mid = l + r >> 1;
    pushdown(k,l,r,mid);
    if(x <= mid) update(k*2,l,mid,x,y,v);
    if(y > mid) update(k*2+1,mid+1,r,x,y,v);

    t[k] = t[k*2] + t[k*2+1];
}

inline int query(int k,int l,int r,int x,int y){
    if(x <= l && y >= r) return t[k];
    
    int mid = l+r>>1,res=0;
    pushdown(k,l,r,mid);
    if(x <= mid) res = query(k*2,l,mid,x,y);
    if(y > mid) res += query(k*2+1,mid+1,r,x,y);
    
    return res;
}

signed main() {
    
    cin >> n >> m;
    
    for(int i = 1; i <= n; i++)
        cin >> a[i];
    
    build(1,1,n);
    
    int x,y,z;
    while(m--){
        cin >> x;
        if(x == 2){
            cin >> x >> y;
            cout << query(1,1,n,x,y) << endl;
        }else{
            cin >> x >> y >> z;
            update(1,1,n,x,y,z);
        }
    }
    
    return 0;
}