#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<string>
#include<ctime>
#include<cmath>
#include<set>
#include<map>
#include<queue>
#include<algorithm>
#include<iomanip>
#include<stack>
using namespace std;
#define FILE "dealing"
#define up(i,j,n) for(int i=(j);i<=(n);i++)
#define pii pair<int,int>
#define LL long long
#define mem(f,g) memset(f,g,sizeof(f))
namespace IO{
	char buf[1<<15],*fs,*ft;
	int gc(){return (fs==ft&&(ft=(fs=buf)+fread(buf,1,1<<15,stdin),fs==ft))?-1:*fs++;}
	int read(){
		int ch=gc(),f=0,x=0;
		while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=1;ch=gc();}
		while(ch>=‘0‘&&ch<=‘9‘){x=(x<<1)+(x<<3)+ch-‘0‘;ch=gc();}
		return f?-x:x;
	}
	int readint(){
		int ch=getchar(),f=0,x=0;
		while(ch<‘0‘||ch>‘9‘){if(ch==‘-‘)f=1;ch=getchar();}
		while(ch>=‘0‘&&ch<=‘9‘){x=(x<<1)+(x<<3)+ch-‘0‘;ch=getchar();}
		return f?-x:x;
	}
}using namespace IO;
const int maxn=201000,inf=1000000000;
int n,m;
int ch[maxn],l[maxn],r[maxn],k[maxn],f[maxn];
struct node{
	int k,id;
	bool operator<(const node& b)const{return k<b.k;}
}Cnt[maxn];
int L=0;
namespace OI{
	#define mid ((l+r)>>1)
	const int maxm=20000000;
	int root=0,c[maxn][2],id[maxn],cnt=0;//权值线段树
	LL sum[maxm],flag[maxm];
	int d[maxm][2],len=0;//区间线段树
	int x,y,key;
	void pushdown(int o,int l,int r){
		if(flag[o]){
			if(l!=r&&!d[o][0])d[o][0]=++len;
			if(l!=r&&!d[o][1])d[o][1]=++len;
			sum[d[o][0]]+=flag[o]*(mid-l+1);
			sum[d[o][1]]+=flag[o]*(r-mid);
			flag[d[o][0]]+=flag[o];
			flag[d[o][1]]+=flag[o];
			flag[o]=0;
		}
	}
	void change(int l,int r,int& o){
		if(l>y||r<x)return;
		if(!o)o=++len;
		if(l>=x&&r<=y){
			sum[o]+=r-l+1;
			flag[o]++;
			return;
		}
		pushdown(o,l,r);
		change(l,mid,d[o][0]);
		change(mid+1,r,d[o][1]);
		sum[o]=sum[d[o][1]]+sum[d[o][0]];
	}
	void insert(int l,int r,int& o){
		if(l>key||r<key)return;
		if(!o)o=++cnt;
		change(1,n,id[o]);
		if(l==key&&r==key)return;
		insert(l,mid,c[o][0]);
		insert(mid+1,r,c[o][1]);
	}
	void init(int l,int r,int k){
		x=l,y=r,key=k;
		insert(1,L,root);
	}
	int query2(int l,int r,int o){
		if(l>y||r<x||!o)return 0;
		if(l>=x&&r<=y)return sum[o];
		pushdown(o,l,r);
		return query2(l,mid,d[o][0])+query2(mid+1,r,d[o][1]);
	}
	int query1(int l,int r,int o){
		if(!o||r<=key)return 0;
		if(l>key)return query2(1,n,id[o]);
		return query1(l,mid,c[o][0])+query1(mid+1,r,c[o][1]);
	}
	int Query(int l,int r,int val){
		x=l,y=r,key=val;
		return query1(1,L,root)+1;
	}
	int Q(int l,int r,int k){
		int left=1,right=L,midd,p;
		while(left+1<right){
			midd=(left+right)>>1;
			if(Query(l,r,midd)>k)left=midd;
			else right=midd;
		}
		if(Query(l,r,left)>k&&Query(l,r,right)<=k)return right;
		else return left;
	}
}using namespace OI;
void print(int *a,int n){up(i,1,n)printf("%d ",a[i]);cout<<endl;}
int main(){
	freopen(FILE".in","r",stdin);
	freopen(FILE".out","w",stdout);
	n=read(),m=read();
	up(i,1,m){
		ch[i]=read(),l[i]=read(),r[i]=read(),k[i]=read();
		if(ch[i]==1)Cnt[++L].k=k[i],Cnt[L].id=i;
	}
	sort(Cnt+1,Cnt+L+1);
	up(i,1,L)f[Cnt[i].id]=i;
	int pre=0,d=(1LL<<8)-1;
	up(i,1,m){
		l[i]^=(pre&d),r[i]^=(pre&d);
		if(!l[i])l[i]=1;if(!r[i])r[i]=1;
		if(l[i]>r[i])swap(l[i],r[i]);
		if(ch[i]==1)init(l[i],r[i],f[i]);
		if(ch[i]==2)printf("%d\n",pre=Cnt[Q(l[i],r[i],k[i])].k);
	}
	return 0;
}