/*** author: yuji9511 ***/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> lpair;
const ll MOD = 1e9 + 7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i = (m); i < (n); i++)
#define rrep(i,m,n) for(ll i = (m); i >= (n); i--)
#define print(x) cout << (x) << endl;
#define print2(x,y) cout << (x) << " " << (y) << endl;
#define printa(x,n) for(ll i = 0; i < n; i++){ cout << (x[i]) << " \n"[i==n-1];};
struct LazySegmentTree {
private:
    int n;
    vector<ll> node, lazy;
 
public:
    LazySegmentTree(vector<ll> v) {
        int sz = (int)v.size();
        n = 1; while(n < sz) n *= 2;
        node.resize(2*n-1);
        lazy.resize(2*n-1, 0);
 
        for(int i=0; i<sz; i++) node[i+n-1] = v[i];
        for(int i=n-2; i>=0; i--) node[i] = node[i*2+1] + node[i*2+2];
    }
 
    void eval(int k, int l, int r) {
        if(lazy[k] != 0) {
            node[k] += lazy[k];
            if(r - l > 1) {
                lazy[2*k+1] += lazy[k] / 2;
                lazy[2*k+2] += lazy[k] / 2;
            }
            lazy[k] = 0;
        }
    }
 
    void add(int a, int b, ll x, int k=0, int l=0, int r=-1) {
        if(r < 0) r = n;
        eval(k, l, r);
        if(b <= l || r <= a) return;
        if(a <= l && r <= b) {
            lazy[k] += (r - l) * x;
            eval(k, l, r);
        }
        else {
            add(a, b, x, 2*k+1, l, (l+r)/2);
            add(a, b, x, 2*k+2, (l+r)/2, r);
            node[k] = node[2*k+1] + node[2*k+2];
        }
    }
 
    ll getsum(int a, int b, int k=0, int l=0, int r=-1) {
        if(r < 0) r = n;
        eval(k, l, r);
        if(b <= l || r <= a) return 0;
        if(a <= l && r <= b) return node[k];
        ll vl = getsum(a, b, 2*k+1, l, (l+r)/2);
        ll vr = getsum(a, b, 2*k+2, (l+r)/2, r);
        return vl + vr;
    }
};

struct BIT { //1-indexed
private:
    int n,n2;
    vector<ll> bit;

public:
    BIT(ll N){
        n = N;
        bit.assign(n+1, 0);
        n2 = 1;
        while(n2 * 2 <= n) n2 *= 2;
    }

    ll sum(ll x){ //[1, x]
        ll res = 0;
        for(ll i = x; i > 0; i -= i & -i) res += bit[i];
        return res;
    }

    void add(ll x, ll v){
        if(x == 0) return;
        for(ll i = x; i <= n; i += i & -i) bit[i] += v;
    }

    ll lower_bound(ll w) {
        if (w <= 0) return 0;
        ll x = 0;
        for (ll k = n2; k > 0; k /= 2) {
            if (x + k <= n && bit[x + k] < w) {
                w -= bit[x + k];
                x += k;
            }
        }
        return x + 1;
    }
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N,Q;
    cin >> N >> Q;
    vector<ll> v(100010);
    rep(i,0,N) cin >> v[i];
    LazySegmentTree sg(v);
    BIT bit(100010);
    rep(i,0,N-1){
        if(v[i] != v[i+1]) bit.add(i+1, 1);
    }
    while(Q--){
        ll n,l,r,x;
        cin >> n;
        if(n == 1){
            cin >> l >> r >> x;
            l--; r--;
            sg.add(l, r+1, x);
            if(l != 0){
                ll v1 = sg.getsum(l-1, l);
                ll v2 = sg.getsum(l, l+1);
                ll v3 = bit.sum(l) - bit.sum(l-1);
                if(v1 == v2){
                    bit.add(l, -v3);
                }else{
                    bit.add(l, -v3+1);
                }
            }
            if(r != N-1){
                ll v1 = sg.getsum(r,r+1);
                ll v2 = sg.getsum(r+1, r+2);
                ll v3 = bit.sum(r+1) - bit.sum(r);
                if(v1 == v2){
                    bit.add(r+1, -v3);
                }else{
                    bit.add(r+1, -v3+1);
                }
            }
        }else{
            cin >> l >> r;
            l--; r--;
            print(1 + bit.sum(r) - bit.sum(l));
        }
        
    }

}