#include <iostream>
#include <vector>
#include <algorithm>
#include <array>
#include <iterator>
#include <string>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cmath>
#include <ctime>
#include <iomanip>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <random>
#include <utility>
#include <functional>
using namespace std;

template<class T,T (*op)(T,T),T (*e)()> struct segtree
{
	private:
	int size,N;
	vector<T> node;

	public:
	segtree(int N = 0) : segtree(vector<T>(N,e())) {}

	segtree(const vector<T> &V)
	{
		N = (int)V.size();
		size = 1;
		while(size < N)
		{
			size <<= 1;
		}
		node.assign(2 * size,e());
		for(int i = 0;i < N;i++)
		{
			node[i + size] = V[i];
		}
		for(int i = size - 1;i >= 1;i--)
		{
			node[i] = op(node[2 * i],node[2 * i + 1]);
		}
	}

	void replace(int pos,T x)
	{
		func_update(pos,x,[](T u,T v){return u = v;});
	}

	void add(int pos,T x)
	{
		func_update(pos,x,[](T u,T v){return u + v;});
	}

	void func_update(int pos,T x)
	{
		func_update(pos,x,op);
	}

	void func_update(int pos,T x,T (*func)(T,T))
	{
		assert(0 <= pos && pos < N);
		pos += size;
		node[pos] = func(node[pos],x);
		while(pos >> 1)
		{
			pos >>= 1;
			node[pos] = op(node[2 * pos],node[2 * pos + 1]);
		}
	}

	T operator[](int pos)
	{
		assert(0 <= pos && pos < N);
		return node[pos + size];
	}

	int get_log()
	{
		int res = 0;
		while(1 << res < size)
		{
			res++;
		}
		assert((1 << res) == size);
		return res;
	}

	vector<vector<T>> tree_list()
	{
		vector<vector<T>> res;
		int log = get_log();
		res.reserve(log + 1);
		for(int i = 0;i <= log;i++)
		{
			int L = 1 << log,R = L << 1;
			vector<T> cur(node.begin() + L,node.begin() + R);
			res.push_back(cur);
		}
		return res;
	}

	//suppose that class T has ostream &operator<<
	void print(int k)
	{
		assert(0 <= k && k <= get_log());
		int L = 1 << k,R = L << 1;
		for(int i = L;i < R;i++)
		{
			cerr << node[i] << (i + 1 == R ? "\n":" ");
		}
	}

	void print()
	{
		int log = get_log();
		for(int k = 0;k <= log;k++)
		{
			int L = 1 << k,R = L << 1;
			const string unit((1 << (log - k)) - 1,' ');
			for(int i = L;i < R;i++)
			{
				if(i == L)
				{
					cerr << unit;
				}
				cerr << node[i];
				if(i + 1 < R)
				{
					cerr << unit << unit << ' ';
				}
				else
				{
					cerr << unit;
				}
			}
			cerr << "\n";
		}
	}

	T prod(int l,int r)
	{
		assert(0 <= l && l <= r && r <= N);
		T L = e(),R = e();
		l += size,r += size;
		while(l < r)
		{
			if(l & 1)
			{
				L = op(L,node[l++]);
			}
			if(r & 1)
			{
				R = op(node[--r],R);
			}
			l >>= 1,r >>= 1;
		}
		return op(L,R);
	}
	T prod()
	{
		return node[1];
	}

	template<class F> int max_right(int l,F f)
	{
		assert(0 <= l && l <= N);
		assert(f(e()));
		if(l == N)
		{
			return N;
		}
		l += size;
		T val = e();
		do
		{
			while(!(l & 1))
			{
				l >>= 1;
			}
			if(!f(op(val,node[l])))
			{
				while(l < size)
				{
					l <<= 1;
					if(f(op(val,node[l])))
					{
						val = op(val,node[l++]);
					}
				}
				return l - size;
			}
			val = op(val,node[l++]);
		} while((l & -l) != l);
		return N;
	}

	template<class F> int min_left(int r,F f)
	{
		assert(0 <= r && r <= N);
		assert(f(e()));
		if(r == 0)
		{
			return 0;
		}
		r += size;
		T val = e();
		do
		{
			r--;
			while(r > 1 && (r & 1))
			{
				r >>= 1;
			}
			if(!f(op(node[r],val)))
			{
				while(r < size)
				{
					r <<= 1;
					r++;
					if(f(op(node[r],val)))
					{
						val = op(node[r--],val);
					}
				}
				return r + 1 - size;
			}
			val = op(node[r],val);
		} while((r & -r) != r);
		return 0;
	}
};
template<class T,T (*op)(T,T),T e(),class F,T (*mapping)(F,T),F (*composition)(F,F),F id()> struct LazySegmentTree
{
    private:
    vector<T> node;
    vector<F> lazy;
    int siz,log;

    void map_and_comp(F f,int u)
    {
        node[u] = mapping(f,node[u]);
        if(u < siz) lazy[u] = composition(f,lazy[u]);
    }

    void propagate(int u)
    {
        assert(0 <= u && u < siz);

        map_and_comp(lazy[u],2*u);
        map_and_comp(lazy[u],2*u+1);

        lazy[u] = id();
    }

    void recalculate(int u) {node[u] = op(node[2*u],node[2*u+1]);}

    public:
    LazySegmentTree(int n = 0) : LazySegmentTree(vector<T>(n,e())) {}
    LazySegmentTree(const vector<T> &V)
    {
	    siz = 1;
	    log = 0;
	    while(siz < (int)V.size()) siz <<= 1,log++;
	    node.assign(2*siz,e());
	    lazy.assign(siz,id());
	    for(int i = 0;i < (int)V.size();i++) node[i+siz] = V[i];
	    for(int i = siz-1;i >= 1;i--) recalculate(i);
    }

    void fill(T x,int l = 0,int r = -1) {if(r < 0){r = siz;} for(int i = l;i < r;i++) replace(i,x);}

    void clear() {fill(e());}

    void replace(int pos,T x) {func_update(pos,x,[](T u,T v){return u = v;});}

    void add(int pos,T x) {func_update(pos,x,[](T u,T v){return u + v;});}

    void func_update(int pos,T x,T (*func)(T,T))
    {
        assert(0 <= pos && pos < siz);
        pos += siz;

        for(int i = log;i >= 1;i--) propagate(pos >> i);

        node[pos] = func(node[pos],x);

        for(int i = 1;i <= log;i++) recalculate(pos >> i);
    }

    T operator[](int pos)
    {
        assert(0 <= pos && pos < siz);

        pos += siz;
        for(int i = log;i >= 1;i--) propagate(pos >> i);
        return node[pos];
    }

    void apply(int pos,F f)
    {
        assert(0 <= pos && pos < siz);
        pos += siz;

        for(int i = log;i >= 1;i--) propagate(pos >> i);

        node[pos] = mapping(f,node[pos]);

        for(int i = 1;i <= log;i++) recalculate(pos >> i);
    }

    void apply(int l,int r,F f)
    {
        assert(0 <= l && l <= r && r <= siz);
        if(l == r) return;

        l += siz;
        r += siz;

        int l0 = l/(l & -l);
        int r0 = r/(r & -r);

        for(int i = log;i >= 1;i--) propagate(l0 >> i);
        for(int i = log;i >= 1;i--) propagate((r0-1) >> i);

        while(l < r)
        {
            if(l & 1) map_and_comp(f,l++);
            if(r & 1) map_and_comp(f,--r);

            l >>= 1;
            r >>= 1;
        }

        for(int i = 1;i <= log;i++) recalculate(l0 >> i);
        for(int i = 1;i <= log;i++) recalculate((r0-1) >> i);
    }

    T prod() {return node[1];}

    T prod(int l,int r)
    {
        assert(0 <= l && l <= r && r <= siz);

        l += siz;
        r += siz;

        int l0 = l/(l & -l);
        int r0 = r/(r & -r);

        for(int i = log;i >= 1;i--) propagate(l0 >> i);
        for(int i = log;i >= 1;i--) propagate((r0-1) >> i);

        T Lval = e(),Rval = e();
        while(l < r)
        {
            if(l & 1) Lval = op(Lval,node[l++]);
            if(r & 1) Rval = op(node[--r],Rval);

            l >>= 1;
            r >>= 1;
        }

        return op(Lval,Rval);
    }
};

struct dat
{
	int len;
	int dp[4][4]{};
};
dat op(dat a,dat b)
{
	dat x;
	x.len = a.len + b.len;
	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++)
				{
					x.dp[i][l] = max(x.dp[i][l],a.dp[i][j] + b.dp[k][l]);
				}
			}
			x.dp[i][j] = max(x.dp[i][j],a.dp[i][j]);
			x.dp[i][j] = max(x.dp[i][j],b.dp[i][j]);
		}
	}
	return x;
}
dat e()
{
	dat x;
	x.len = 0;
	for(int i = 0;i < 4;i++)
	{
		for(int j = 0;j < 4;j++)
		{
			x.dp[i][j] = -(int)1e9;
		}
	}
	return x;
}
dat mp(int f,dat x)
{
	if(f != -1)
	{
		for(int i = 0;i < 4;i++)
		{
			for(int j = i;j < 4;j++)
			{
				x.dp[i][j] = 0;
			}
		}
		x.dp[f][f] = x.len;
	}
	return x;
}
int cp(int f,int g)
{
	if(f != -1)
	{
		swap(g,f);
	}
	return g;
}
int id()
{
	return -1;
}
void Main()
{
	int N;
	cin >> N;
	vector<dat> init(N);
	for(int i = 0;i < N;i++)
	{
		int a;
		cin >> a;
		a--;
		init[i].len = 1;
		init[i].dp[a][a] = 1;
	}
	LazySegmentTree<dat,op,e,int,mp,cp,id> seg(init);
	int Q;
	cin >> Q;
	for(;Q--;)
	{
		int t;
		cin >> t;
		if(t == 1)
		{
			int l,r;
			cin >> l >> r;
			l--;
			dat x = seg.prod(l,r);
			int ans = 0;
			for(int i = 0;i < 4;i++)
			{
				for(int j = i;j < 4;j++)
				{
					ans = max(ans,x.dp[i][j]);
				}
			}
			cout << ans << "\n";
		}
		else
		{
			int l,r,x;
			cin >> l >> r >> x;
			x--; l--;
			seg.apply(l,r,x);
		}
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	/* cin >> tt; */
	while(tt--) Main();
}