CodeEff/ECCO huggingface dataset:
# Original solution
num=int(input())
tmp=[]
for i in range(num):
    tmp.append(int(input()))

output=0
for i in set(tmp):
    if tmp.count(i)%2 ==1:
        output+=1
print(output)

# Optimized solution
num=int(input())
tmp={}
for i in range(num):
    a=int(input())
    if a in tmp:
        tmp[a]+=1
    else:
        tmp[a]=1

output=0
for i in tmp:
    if tmp[i]%2 ==1:
        output+=1
print(output)
# Original solution
import bisect

n = int(eval(input()))

l = []
for _ in range(n):
    a = int(eval(input()))
    i = bisect.bisect_left(l, a)
    if i != len(l) and l[i] == a:
        l.pop(i)
    else:
        l.insert(i, a)

res = len(l)
print(res)

# Optimized solution
n = int(eval(input()))

s = set()
for _ in range(n):
    s ^= {eval(input())}

print((len(s)))
# Original solution
N=int(eval(input()))
A=[]
for _ in range(N):
    a=int(eval(input()))
    if a not in A:
        A.append(a)
    else:
        A.remove(a)
print((len(A)))

# Optimized solution
N=int(eval(input()))
A=set()
for _ in range(N):
    a=int(eval(input()))
    if a not in A:
        A.add(a)
    else:
        A.remove(a)
print((len(A)))
# Original solution
import sys
input=sys.stdin.readline
n=int(eval(input()))
a=[]
for i in range(n):
    b=int(eval(input()))
    if b in a:
        a.remove(b)
    else:
        a.append(b)
print((len(a))) 

# Optimized solution
import sys
input=sys.stdin.readline
n=int(eval(input()))
a=[int(eval(input())) for _ in range(n)]
a.sort()
h=a[0]
ans=1
for i in a[1:]:
    if i!=h:
        ans+=1
        h=i
    else:
        ans-=1
        h=pow(10,10)    
print(ans)
# Original solution
def solve():  # 073C - Write and Erase
    N = int(eval(input()))
    joisino_list = []

    for _ in range(N):
        a = int(eval(input()))
        if a not in joisino_list:
            joisino_list.append(a)
        else:
            joisino_list.remove(a)

    print((len(joisino_list)))
    

solve()

# Optimized solution

def solve():  # 073C - Write and Erase
    N = int(eval(input()))
    joisino_list = {}
    cnt = 0

    for _ in range(N):
        a = int(eval(input()))

        if a in joisino_list:
            joisino_list[a] += 1
        else:
            joisino_list[a] = 1

    for i in list(joisino_list.values()):
        if i % 2:
            cnt += 1

    print(cnt)
    
  
solve()
# Original solution
N = int(eval(input()))
ans = []
for _ in range(N):
    a = int(eval(input()))
    if a not in ans:
        ans.append(a)
    else:
        ans.remove(a)
print((len(ans)))

# Optimized solution
N = int(eval(input()))
ans = {}
for _ in range(N):
    a = int(eval(input()))
    if a in ans:
        ans[a] = 1 - ans[a]
    else:
        ans[a] = 1
print((sum(ans.values())))
# Original solution
from collections import Counter

N = int(eval(input()))
A = [int(eval(input())) for i in range(N)]
a = list(Counter(A).values())
a = [i for i in a if i % 2 == 1]

print((len(a)))

# Optimized solution
from collections import Counter

N, *A = list(map(int, open(0).read().split()))
a = list(Counter(A).values())
a = [i for i in a if i % 2 == 1]

print((len(a)))
# Original solution
# -*- coding: utf-8 -*-
import sys
import copy
import collections
from bisect import bisect_left
from bisect import bisect_right
from collections import defaultdict
from heapq import heappop, heappush
import math

# NO, PAY-PAY
#import numpy as np
#import statistics
#from statistics import mean, median,variance,stdev

def inputInt(): return int(eval(input()))
def inputMap(): return list(map(int, input().split()))
def inputList(): return list(map(int, input().split()))
 
def main():
    N = inputInt()
    ans = []
    for _ in range(N):
        tmp = inputInt()
        if tmp in ans:
            ans.remove(tmp)
        else:
            ans.append(tmp)
            ans.sort()
        
    print((len(ans)))
        
            	
if __name__ == "__main__":
	main()


# Optimized solution
# -*- coding: utf-8 -*-
import sys
import copy
import collections
from bisect import bisect_left
from bisect import bisect_right
from collections import defaultdict
from heapq import heappop, heappush
import math

# NO, PAY-PAY
#import numpy as np
#import statistics
#from statistics import mean, median,variance,stdev

def inputInt(): return int(eval(input()))
def inputMap(): return list(map(int, input().split()))
def inputList(): return list(map(int, input().split()))
 
def main():
    N = inputInt()
    ans = {}
    for _ in range(N):
        tmp = inputInt()
        if tmp in ans:
            ans[tmp] += 1
        else:
            ans[tmp] = 1
        
    o = 0
    for v in list(ans.values()):
        if v % 2 == 1:
            o += 1
    print(o)
        
            	
if __name__ == "__main__":
	main()
# Original solution
n=int(eval(input()))
li=[]
ans=0
fl=1

for i in range(n):
    li.append(int(eval(input())))

li.sort()

for j in range(n-1):
    if li[j]!=li[j+1]:
        if fl%2==1:
            ans+=1
            fl=1
        else:
            fl=1
    else:
        fl+=1


if fl%2==1:
    ans+=1

print(ans)

# Optimized solution
n=int(eval(input()))
li=set()

for i in range(n):
    a=int(eval(input()))
    if a in li:
        li.remove(a)
    else:
        li.add(a)
 
print((len(li)))
# Original solution
n=int(eval(input()))
a=[]
for i in range(n):
  a.append(int(eval(input())))
f=[0 for i in range(max(a))]
for x in a:
  f[x-1]+=1
  f[x-1]%=2
print((sum(f)))

# Optimized solution
n=int(eval(input()))
a=[0 for _ in range(n)]
for i in range(n):
  a[i]=int(eval(input()))
a.sort()
ans,cnt=0,0
p=-1
for x in a:
  if p==x:
    cnt+=1
  else:
    p=x
    if cnt%2==1:
      ans+=1
    cnt=1
if cnt%2==1:
  ans+=1
print(ans)
# Original solution

A=[]
n=int(eval(input()))
for i in range(n):
    num=int(eval(input()))
    if(num in A):
        A.remove(num)
    else:
        A.append(num)
print((len(A)))


# Optimized solution
A={-1:False}
n=int(eval(input()))
count=0
for i in range(n):
    num=int(eval(input()))
    try:
        
        if(A[num]==True):
            count-=1
            A[num]=False
        else:
            count+=1
            A[num]=True
    except:
        #print("exception",A,num)
        A[num]=True
        count+=1
print(count)
# Original solution
from collections import Counter as C

n = int(eval(input()))
a = C([eval(input()) for _ in range(n)])

print((sum([1 for v in list(a.values()) if v % 2])))

# Optimized solution
from collections import Counter as C

n = int(eval(input()))
a = C([eval(input()) for _ in range(n)])

print((sum([v % 2 for v in list(a.values())])))
# Original solution
n=int(eval(input()))
a=list(int(eval(input())) for _ in range(n))
A=list(set(a))
cnt=0
for i in range(len(A)):
    c=a.count(A[i])
    if c%2==0:
        continue
    else:
        cnt+=1
print(cnt)

# Optimized solution
n=int(eval(input()))
a=list(int(eval(input())) for _ in range(n))
a.sort()
cnt=1
ans=0
for i in range(n-1):
    if a[i]==a[i+1]:
        cnt+=1
    else:
        if cnt%2==0:
            cnt=1
        else:
            ans+=1
            cnt=1
if a[-2]==a[-1]:
    if cnt%2==1:
        ans+=1
else:
    ans+=1
print(ans)
# Original solution
loops = int(eval(input()))
paper = []

# 1 <= loops <= 10^6
for _ in range(loops):
    num = int(eval(input()))
    if num in paper:
        paper.remove(num)
    else:
        paper.append(num)
print((len(paper)))


# Optimized solution
loops = int(eval(input()))
d = {}

# 10^6
for _ in range(loops):
    key = eval(input())
    if key not in d: # ?
        d[key] = 1
    else:
        d[key] += 1

# 10^6
ans = 0
for k,v in list(d.items()):
    if v % 2 != 0:
        ans += 1
print(ans)
# Original solution
n=int(eval(input()))
x=sorted([int(eval(input())) for i in range(n)])

def groupby(a):
    a2=[[a[0],1]]
    for i in range(1,len(a)):
        if a2[-1][0]==a[i]:
            a2[-1][1]+=1
        else:
            a2.append([a[i],1])
    return a2

y=groupby(x)
c=0
for i in y:
    if i[1]%2==1:
        c+=1
print(c)


# Optimized solution
n=int(eval(input()))
s=set()
for i in range(n):
    a=int(eval(input()))
    if a in s:
        s.remove(a)
    else:
        s.add(a)
print((len(s)))
# Original solution
if __name__ == "__main__":
    N = int(eval(input()))
    A = []
    for i in range(N):
        Ai = int(eval(input()))
        if Ai in A:
            A.remove(Ai)
        else:
            A.append(Ai)
    print((len(A)))

# Optimized solution
if __name__ == "__main__":
    N = int(eval(input()))
    #A = []
    d = {}
    for i in range(N):
        Ai = int(eval(input()))
        if Ai in list(d.keys()):
            d[Ai] = not d[Ai]
        else:
            d[Ai] = True
    
    ans = 0
    for item in list(d.items()):
        if item[1]:
            ans += 1
    
    print(ans)
# Original solution
from collections import Counter, deque
# from copy import copy, deepcopy
# from fractions import gcd
# from functools import reduce
# from itertools import accumulate, permutations, combinations, combinations_with_replacement, groupby, product
# import math
# import numpy as np
# from operator import xor
import sys
sys.setrecursionlimit(10 ** 5 + 10)
# input = sys.stdin.readline

def resolve():
    N=int(eval(input()))
    A=[int(eval(input())) for i in range(N)]

    AA=Counter(A)
    cnt=0
    for i in list(AA.values()):
        if i%2==1:
            cnt+=1

    print(cnt)

resolve()

# Optimized solution
from collections import Counter, deque # https://note.nkmk.me/python-scipy-connected-components/
# from copy import copy, deepcopy
# from fractions import gcd
# from functools import reduce
# from itertools import accumulate, permutations, combinations, combinations_with_replacement, groupby, product
# import math
# import numpy as np  # Pythonのみ！
# from operator import xor
# import re
# from scipy.sparse.csgraph import connected_components  # Pythonのみ！
# ↑cf.  https://note.nkmk.me/python-scipy-connected-components/
# from scipy.sparse import csr_matrix
# import string
import sys
sys.setrecursionlimit(10 ** 5 + 10)
def input(): return sys.stdin.readline().strip()

def resolve():
    N=int(eval(input()))
    A=[int(eval(input())) for i in range(N)]
    AA=Counter(A)

    cnt=0
    for i in list(AA.values()):
        if i%2==1:
            cnt+=1
    print(cnt)



resolve()
# Original solution
n = int(eval(input()))
a = [int(eval(input())) for _ in range(n)]
check = set(a)
ans = len(check)

for i in check:
    if a.count(i) % 2 == 0:
        ans -= 1

print(ans)

# Optimized solution
n = int(eval(input()))
array = {}

for i in range(n):
    a = int(eval(input()))
    if a not in array:
        array[a] = 1
    elif array[a] == 1:
        array[a] -= 1
    else:
        array[a] += 1

print((sum(array.values())))
# Original solution
N = int(eval(input()))
a = []
for i in range(N):
    num = int(eval(input()))
    if(num not in a):
        a.append(num)
    else:
        a.remove(num)
print((len(a)))

# Optimized solution
N = int(eval(input()))
A = []
for _ in range(N):
    A.append(int(eval(input())))
A = sorted(A)
cnt = 1
ans = 0

for i in range(N-1):
    if(A[i] == A[i+1]):
        cnt += 1
        continue
    ans += cnt % 2
    cnt = 1

if(cnt % 2 == 1):
    ans += 1

print(ans)
# Original solution
#!/usr/bin/env pypy3
ans = 0
n = int(eval(input()))
for i in range(1, n + 1):
    k = n // i
    ans += i * k * (k + 1) // 2
print(ans)


# Optimized solution
#!/usr/bin/env pypy
ans = 0
n = int(eval(input()))
for i in range(1, n + 1):
    k = n // i
    ans += i * k * (k + 1) // 2
print(ans)
# Original solution
#!/usr/bin/env pypy
ans = 0
n = int(eval(input()))
for i in range(1, n + 1):
    k = n // i
    ans += i * k * (k + 1) // 2
print(ans)


# Optimized solution
ans = 0
n = int(eval(input()))
for i in range(1, n + 1):
    k = n // i
    ans += i * k * (k + 1) // 2
print(ans)
# Original solution
import sys
read = sys.stdin.readline
import time
import math
import itertools as it
def inpl():
    return list(map(int, input().split()))
st = time.perf_counter()
# ------------------------------

N = int(read())
ans = 0
for i in range(1, N+1):
    n = N // i
    ans += 0.5 * n * (2*i + i * (n-1))
print(int(ans))

# ------------------------------
ed = time.perf_counter()
print('time:', ed-st, file=sys.stderr)


# Optimized solution
N = int(eval(input()))
ans = 0
for i in range(1, N+1):
    n = N // i
    ans += 0.5 * n * (2*i + i * (n-1))
print((int(ans)))
# Original solution
N = int(eval(input()))
ans = 0

for i in range(1, N + 1):

    n = N // i
    temp = (n * (n + 1) * i) // 2
    ans += temp

print(ans)


# Optimized solution
# for内をご丁寧に書いていたらTLEを食らった
# PyPyだとそのままで通った、すごい
# for内の冗長な部分を排除しまくったらPythonでも通った

# N=6とかで実験して、横で見ていたのを縦から眺めてみると良い（伝われ）
# (1+2+...+6) + (2+4+6) + ... + (6)と見る
# 結局何を足したいのか考えて約数のところを書き換える（伝われ）

N = int(eval(input()))
ans = 0

for i in range(1, N + 1):

    n = N // i
    temp = (n * (n + 1) * i) // 2
    ans += temp

print(ans)
# Original solution
N = int(eval(input()))
 
sum = 0
for n in range(1,N+1):
    num = N//n
    s = ((1+num)*num)//2
    sum += n*s
print(sum)

# Optimized solution
N = int(eval(input()))
 
sum = 0
for n in range(1,N+1):
    num = N//n
    sum += n*((1+num)*num)//2
print(sum)
# Original solution
N = int(eval(input()))
ans = 0

for i in range(1, N + 1):

    cnt = N // i
    ans += (cnt * (cnt + 1) * i // 2) 

print(ans)


# Optimized solution
N=int(eval(input()));a=0
for i in range(1,N + 1):b=N//i;a+=(b*(b+1)*i//2)
print(a)
# Original solution
#!/usr/bin/env python3
# input

n = int(eval(input()))
ans = n * (n + 1) - 1  # 1とk 自信

i = 2
while i * i <= n:
    num = n // i
    min_i = i * i
    max_i = i * num
    ans += (num - i + 1) * (min_i + max_i)  # 自分自身
    ans -= min_i
    i += 1
print(ans)


# Optimized solution
#!/usr/bin/env python3


def main():
    n = int(eval(input()))
    ans = n * (n + 1) - 1  # 1とk 自信

    i = 2
    while i * i <= n:
        num = n // i
        min_i = i * i
        max_i = i * num
        ans += (num - i + 1) * (min_i + max_i)  # 自分自身
        ans -= min_i
        i += 1
    print(ans)


if __name__ == "__main__":
    main()
# Original solution
N = int(eval(input()))
ans = 0
for i in range(1, N + 1):
    n = N // i
    cnt = (n * (2 * i + (n - 1) * i)) // 2
    ans += cnt
print(ans)

# Optimized solution
N = int(eval(input()))
ans = 0
for i in range(1, N + 1):
    n = N // i  # 項数n
    cnt = (n * (2 * i + (n - 1) * i)) // 2  # 初項i, 項数n の等差数列の和の公式
    ans += cnt
print(ans)
# Original solution
N = int(eval(input()))

ans = 0
for i in range(1,N+1):
    k = N // i
    ans += (i + i*k) * k // 2
print(ans)

# Optimized solution
N = int(eval(input()))
ans = 0
for i in range(1,N+1):
    k = N // i
    ans += i * k * (k+1) // 2
print(ans)
# Original solution
import sys, math, itertools, collections, bisect
input = lambda: sys.stdin.buffer.readline().rstrip().decode('utf-8') 
inf = float('inf') ;mod = 10**9+7 
mans = inf ;ans = 0 ;cnt = 0 ;pro = 1

n = int(eval(input()))
for i in range(1, n+1):
    y = n//i
    ans += y*(y+1)*i//2
print(ans)

# Optimized solution
import sys, math, itertools, collections, bisect
input = lambda: sys.stdin.buffer.readline().rstrip().decode('utf-8') 
inf = float('inf') ;mod = 10**9+7 
mans = inf ;ans = 0 ;count = 0 ;pro = 1

n = int(eval(input()))
for i in range(1, n+1):
    y = n//i
    ans += y*(y+1)*i//2
print(ans)
# Original solution
def solve(N):
    ans = 0
    for i in range(1,N+1):
        ans += N//i*(2*i + (N//i-1)*i)//2
    
    return ans 

print((solve(int(eval(input())))))

# Optimized solution
def solve(N):
    ans = 0
    for i in range(1,N+1):
        tmp = N//i
        ans += tmp*(2*i + (tmp-1)*i)//2
    
    return ans 

print((solve(int(eval(input())))))
# Original solution
import math
N = int(eval(input()))
count=0
g = 0
y= 0
for i in range(1,N+1):
  y=int(N/i)
  g=y*(y+1)*i/2
  count+=g

print((int(count)))

# Optimized solution
N = int(eval(input()))
count=0
g = 0
y= 0
for i in range(1,N+1):
  y=int(N/i)
  g=y*(y+1)*i/2
  count+=g

print((int(count)))
# Original solution
import sys
stdin = sys.stdin
sys.setrecursionlimit(10**6)
ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
nn = lambda: list(stdin.readline().split())
ns = lambda: stdin.readline().rstrip()

n = ni()

ans = 0
for k in range(1,n+1):
    ans += (k*(n//k)*(n//k + 1))//2
print(ans)



# Optimized solution
import sys
stdin = sys.stdin
sys.setrecursionlimit(10**6)
ni = lambda: int(ns())
na = lambda: list(map(int, stdin.readline().split()))
nn = lambda: list(stdin.readline().split())
ns = lambda: stdin.readline().rstrip()

n = ni()

ans = 0
for i in range(1,n+1):
    ans += (i*(n//i)*(n//i + 1))//2
print(ans)
# Original solution
N = int(eval(input()))
 
def num_divisors_table(N):
    ans = 0
    for i in range(1, N + 1):
        u = i
        t = i * (N // i)
        n = N // i
        ans += (u + t) * n // 2
    
    return ans

print((num_divisors_table(N)))

# Optimized solution
N = int(eval(input()))

def count(n):
    count = 0
    for i in range(1, N+1):
        n = N // i
        j  = i * n
        count += (i + j) * n // 2
    return count

print((count(N)))
# Original solution
n=int(eval(input()));print((sum(m*((g:=n//m)**2+g-m**2)for m in range(1,int(n**.5)+1))))

# Optimized solution
def j(n):
    print((sum(m*((n//m)**2+n//m-m**2) for m in range(1,int(n**.5)+1))))

if __name__ == "__main__":
    j(int(eval(input())))
# Original solution
import sys
input = lambda: sys.stdin.readline().rstrip()

# SegmentTree
class SegmentTree:
  def __init__(self,n,p,unit,f):
    self.num=2**((n-1).bit_length())
    self.seg=[unit]*(2*self.num)
    for i in range(n):self.seg[i+self.num]=p[i]
    for i in range(self.num-1,0,-1):
      self.seg[i]=f(self.seg[i<<1],self.seg[(i<<1)+1])
    self.f=f
    self.unit=unit
  def update(self,i,x):
    i+=self.num
    self.seg[i]=x
    while i:
      i>>=1
      self.seg[i]=self.f(self.seg[i<<1],self.seg[(i<<1)+1])
  def query(self,l,r):
    ansl=ansr=self.unit
    l+=self.num
    r+=self.num-1
    if l==r:
      return self.seg[l]
    f=self.f
    while l<r:
      if l&1:
        ansl=f(ansl,self.seg[l])
        l+=1
      if ~r&1:
        ansr=f(self.seg[r],ansr)
        r-=1
      l>>=1
      r>>=1
    if l==r:
      ansl=f(ansl,self.seg[l])
    return f(ansl,ansr)


n,q=list(map(int,input().split()))
a=list(map(int,input().split()))
f=lambda x,y: max(x,y)
seg=SegmentTree(n,a,0,f)
for _ in range(q):
  t,a,b=list(map(int,input().split()))
  if t==1:
    seg.update(a-1,b)
  if t==2:
    print((seg.query(a-1,b)))
  if t==3:
    ng=a-1
    ok=n+1
    while ng+1!=ok:
      mid=(ng+ok)//2
      if seg.query(ng,mid)>=b:ok=mid
      else:ng=mid
    print(ok)


# Optimized solution
# セグ木ソラ書き練習
# 10分くらい
# query()でバグらせたので反省
import sys
input = lambda: sys.stdin.readline().rstrip()

class SegmentTree:
    def __init__(self,n,p,unit,f):
        self.num=2**((n-1).bit_length())
        self.seg=[unit]*(self.num*2)
        for i in range(n):
            self.seg[self.num+i]=p[i]
        for i in range(self.num-1,0,-1):
            self.seg[i]=f(self.seg[i<<1],self.seg[(i<<1)+1])
        self.unit=unit
        self.f=f
    def update(self,i,x):
        i+=self.num
        self.seg[i]=x
        while i:
            i>>=1
            self.seg[i]=self.f(self.seg[i<<1],self.seg[(i<<1)+1])
    def query(self,l,r):
        ansl=ansr=self.unit
        l+=self.num
        r+=self.num-1
        if l==r:
            return self.seg[l]
        while l<r:
            if l&1:
                ansl=self.f(ansl,self.seg[l])
                l+=1
            if ~r&1:
                ansr=self.f(self.seg[r],ansr)
                r-=1
            l>>=1
            r>>=1
        if l==r:
            ansl=self.f(ansl,self.seg[l])
        return self.f(ansl,ansr)

n,q=list(map(int,input().split()))
a=list(map(int,input().split()))
f=lambda x,y: max(x,y)
seg=SegmentTree(n,a,0,f)
for _ in range(q):
  t,a,b=list(map(int,input().split()))
  if t==1:
    seg.update(a-1,b)
  if t==2:
    print((seg.query(a-1,b)))
  if t==3:
    ng=a-1
    ok=n+1
    while ng+1!=ok:
      mid=(ng+ok)//2
      if seg.query(ng,mid)>=b:ok=mid
      else:ng=mid
    print(ok)
# Original solution
class RMaxQ:
    
    __slots__ = ["n", "data"]
    
    def __init__(self, li):
        self.n = len(li)
        self.data = li*2
        for i in range(self.n - 1, 0, -1):
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def update(self, i, a):
        i += self.n
        self.data[i] = a
        while i > 1:
            i //= 2
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def add(self, i, a):
        i += self.n
        self.data[i] += a
        while i > 1:
            i //= 2
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def fold(self, l, r):
        l += self.n
        r += self.n
        res = 0
        while l < r:
            if l % 2:
                res = max(self.data[l], res)
                l += 1
            if r % 2:
                r -= 1
                res = max(res, self.data[r])
            l //= 2
            r //= 2
        return res

n, q = list(map(int, input().split()))
A = list(map(int, input().split()))
seg = RMaxQ(A)
for _ in range(q):
    t, x, v = list(map(int, input().split()))
    x -= 1
    if t == 1:
        seg.update(x, v)
    elif t == 2:
        print((seg.fold(x, v)))
    else:
        ng = x
        ok = n+1
        while ok - ng > 1:
            mid = (ok+ng)//2
            if seg.fold(x, mid) >= v:
                ok = mid
            else:
                ng = mid
        print(ok)

# Optimized solution
class RMaxQ:
    
    __slots__ = ["n", "data"]
    
    def __init__(self, li):
        self.n = len(li)
        self.data = li*2
        for i in range(self.n - 1, 0, -1):
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def update(self, i, a):
        i += self.n
        self.data[i] = a
        while i > 1:
            i //= 2
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def add(self, i, a):
        i += self.n
        self.data[i] += a
        while i > 1:
            i //= 2
            self.data[i] = max(self.data[2*i], self.data[2*i+1])
    
    def fold(self, l, r):
        l += self.n
        r += self.n
        res = 0
        while l < r:
            if l % 2:
                res = max(self.data[l], res)
                l += 1
            if r % 2:
                r -= 1
                res = max(res, self.data[r])
            l //= 2
            r //= 2
        return res

import sys
input = sys.stdin.buffer.readline
n, q = list(map(int, input().split()))
A = list(map(int, input().split()))
seg = RMaxQ(A)
for _ in range(q):
    t, x, v = list(map(int, input().split()))
    x -= 1
    if t == 1:
        seg.update(x, v)
    elif t == 2:
        print((seg.fold(x, v)))
    else:
        ng = x
        ok = n+1
        while ok - ng > 1:
            mid = (ok+ng)//2
            if seg.fold(x, mid) >= v:
                ok = mid
            else:
                ng = mid
        print(ok)