#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=0;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

struct S { 
   vector<vector<int>> v;
   int len;
};

S op(S a, S b){
    S c;
    c.v = vector<vector<int>>(4, vector<int>(4));
    for(int i=0;i<4;i++) for(int j=0;j<4;j++){
        c.v[i][j] = max(a.v[i][j],b.v[i][j]);
    }
    for(int i=0;i<4;i++){
        for(int j=i;j<4;j++){
            for(int k=j;k<4;k++){
                for(int l=k;l<4;l++){
                    c.v[i][l] = max(c.v[i][l], a.v[i][j]+b.v[k][l]);
                }
            }
        }
    }
    c.len = a.len + b.len;
    return c;
}

S e(){
    S c;
    c.v = vector<vector<int>>(4, vector<int>(4));
    c.len = 0;
    return c;
}

S mapping(int f, S a) {
    if(f==-1) return a;
    a.v = vector<vector<int>>(4, vector<int>(4));
    a.v[f][f] = a.len;
    return a;
}

int composition(int f, int g) {
    if(f==-1) return g;
    return f;
}

int id(){
    return -1;
}

int main()
{
    int n;
    cin >> n;
    vector<int> a(n);
    rep(i,n) cin >> a[i];
    lazy_segtree<S, op, e,int, mapping, composition, id> seg(n);
    rep(i,n){
        --a[i];
        S c;
        c.v = vector<vector<int>>(4,vector<int>(4));
        c.v[a[i]][a[i]] = 0;
        c.len = 1;
        seg.set(i,c);
    }
    int q;
    cin >> q;
    while(q--){
        int t;
        cin >> t;
        if(t==1){
            int l, r;
            cin >> l >> r;
            --l;
            auto vs = seg.prod(l,r);
            int ans = 0;
            dbg(vs.v);
            rep(i,4) rep(j,4) {
                ans = max(ans, vs.v[i][j]);
            }
            cout<<ans<<endl;
        }
        else{
            int l, r, x;
            cin >> l >> r >> x;
            --l;
            --x;
            seg.apply(l,r,x);
        }
    }
    return 0;
}