Harryxun/sft_time huggingface dataset:
### BUGGY CODE ###

from fractions import gcd

N = int(input())
As = list(map(int, input().split()))

lst = [0]*(max(As)+1)

s = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113,  127, 131, 137, 139, 149, 151, 157, 163, 167, 173,  179, 181, 191, 193, 197, 199, 211, 223, 227, 229,  233, 239, 241, 251, 257, 263, 269, 271, 277, 281,  283, 293, 307, 311, 313, 317, 331, 337, 347, 349,  353, 359, 367, 373, 379, 383, 389, 397, 401, 409,  419, 421, 431, 433, 439, 443, 449, 457, 461, 463,  467, 479, 487, 491, 499, 503, 509, 521, 523, 541,  547, 557, 563, 569, 571, 577, 587, 593, 599, 601,  607, 613, 617, 619, 631, 641, 643, 647, 653, 659,  661, 673, 677, 683, 691, 701, 709, 719, 727, 733,  739, 743, 751, 757, 761, 769, 773, 787, 797, 809,  811, 821, 823, 827, 829, 839, 853, 857, 859, 863,  877, 881, 883, 887, 907, 911, 919, 929, 937, 941,  947, 953, 967, 971, 977, 983, 991, 997]

for a in As:
  i = 0
  if a % s[i] == 0:
    lst[s[i]] += 1
  while a % s[i] == 0:
    a //= s[i]
  i += 1
  while i < len(s):
    if s[i]**2 > a:
      break
    if a % s[i] == 0:
      lst[s[i]] += 1  
    while a % s[i] == 0:
      a //= s[i]
    i += 1
  if a > 1:
    lst[a] += 1
    
if max(lst) < 2:
  print('pairwise coprime')
  exit()
  
t = As[0]

for a in As:
  t = gcd(t,a)
  
if t == 1:
  print('setwise coprime')
else:
  print('not coprime')


### FIXED CODE ###

from fractions import gcd

N = int(input())
As = list(map(int, input().split()))

A = max(As)
lst = [0]*(A+1)
rlt = [0]*(A+1)

for i in range(2, A+1):
  if lst[i] > 0:
    continue
  j = 1
  while i*j <= A:
    if lst[i*j] == 0:
      lst[i*j] = i
    j += 1
  if j == 1:
    break
    
for a in As:
  tmp = -1
  while a > 1:
    if tmp != lst[a]:
      rlt[lst[a]] += 1
      tmp = lst[a]
    a //= lst[a]

r = max(rlt) 

if r < 2:
  print('pairwise coprime')
elif r < N:
  print('setwise coprime')
else:
  print('not coprime')
### BUGGY CODE ###

class BIT:
    """
    1-indexed
    """
    def __init__(self, size):
        self.size = size
        self.data = [0] * (size + 1)

    def add(self, index, value=1):
        while index <= self.size:
            self.data[index] += value
            index += index & (-index)

    def sum(self, index):
        """
        右端含める
        """
        ret = 0
        while index:
            ret += self.data[index]
            index -= index & (-index)
        return ret

    def search(self, val):
        """
        x_1 + ... x_i >= val を満たす最小のi
        """
        i = 0
        s = 0
        step = 1 << (self.size.bit_length() - 1)  # 一番上の長さ

        while step:
            if i + step <= self.size and s + self.data[i + step] < val:
                i += step
                s += self.data[i]
            step //= 2
        return i + 1

N, Q = map(int, input().split())
C = [-1] + list(map(int, input().split()))
tree = BIT(N)

query = [[] for _ in range(N + 1)]
for q in range(Q):
    l, r = map(int, input().split())
    query[r].append((q, l))

index = [-1] * (N + 1)
ans = [0] * Q

for r in range(1, N + 1):
    if index[C[r]] > 0:
        tree.add(index[C[r]], -1)
    tree.add(r, 1)
    index[C[r]] = r

    for q, l in query[r]:
        ans[q] = tree.sum(r) - tree.sum(l - 1)

print(*ans, sep='\n')


### FIXED CODE ###

class BIT:
    """
    1-indexed
    """
    def __init__(self, size):
        self.size = size
        self.data = [0] * (size + 1)

    def add(self, index, value=1):
        while index <= self.size:
            self.data[index] += value
            index += index & (-index)

    def sum(self, index):
        """
        右端含める
        """
        ret = 0
        while index:
            ret += self.data[index]
            index -= index & (-index)
        return ret

    def search(self, val):
        """
        x_1 + ... x_i >= val を満たす最小のi
        """
        i = 0
        s = 0
        step = 1 << (self.size.bit_length() - 1)  # 一番上の長さ

        while step:
            if i + step <= self.size and s + self.data[i + step] < val:
                i += step
                s += self.data[i]
            step //= 2
        return i + 1

N, Q = map(int, input().split())
C = [-1] + list(map(int, input().split()))
tree = BIT(N)

query = [[] for _ in range(N + 1)]
for q in range(Q):
    l, r = map(int, input().split())
    query[r].append((q, l))

index = [-1] * (N + 1)
ans = [0] * Q

for r in range(1, N + 1):
    if index[C[r]] > 0:
        tree.add(index[C[r]], -1)
    tree.add(r, 1)
    index[C[r]] = r

    for q, l in query[r]:
        ans[q] = tree.sum(r) - tree.sum(l - 1)

print(*ans, sep='\n')
### BUGGY CODE ###

n,a,b = map(int,input().split())
blue = ''.join(['b' for i in range(a)])
red = ''.join(['r' for i in range(b)])
s = str()
while len(s) < n:
    s += blue
    if len(s) >= n:
        break
    s += red
    
print(s[:n].count('b'))

### FIXED CODE ###

n,a,b = map(int,input().split())
ans = int(n / (a + b))
rem = n % (a + b)
if rem > a:
    print(ans * a + a)
else:
    print(ans * a + rem)
### BUGGY CODE ###

# -*- coding: utf-8 -*-

import io
import sys
import math
from functools import lru_cache

def solve(ac_lst,l,r):
    # implement process
    cnt = sum(ac_lst[l-1:r])
    if ac_lst[r-1]==1:
        cnt -= 1
    return cnt

def make_ac_lst(s):
    ac_lst = [0] * len(s)
    for i in range(len(s)-1):
        if s[i] == "A" and s[i+1] == "C":
            ac_lst[i] = 1
    if _DEB: logd(f"{ac_lst}")
    return ac_lst

def main():
    # input
    n,q = map(int, input().split())
    s = input()
    
    # process
    ans = ""
    ac_lst = make_ac_lst(s)

    for _ in range(q):
        l,r = map(int, input().split())
        ans += str( solve(ac_lst,l,r) ) + "\n"
         
    # output    
    print(ans)
    return ans
        
### DEBUG I/O ###
_DEB = 0   # 1:ON / 0:OFF

_INPUT = """\
8 3
ACACTACG
3 7
2 3
1 8
"""
_EXPECTED = """\
2
0
3

"""

def logd(str):
    """usage:
    if _DEB: logd(f"{str}")
    """
    if _DEB: print(f"[deb] {str}")

### MAIN ###
if __name__ == "__main__":
    if _DEB:
        sys.stdin = io.StringIO(_INPUT)
        print("!! Debug Mode !!")

    ans = main()

    if _DEB:
        print()
        if _EXPECTED.strip() == ans.strip(): print("!! Success !!")
        else: print(f"!! Failed... !!\nANSWER:   {ans}\nExpected: {_EXPECTED}")

### FIXED CODE ###

# -*- coding: utf-8 -*-

import io
import sys
import math

def solve(ac_lst,l,r):
    # implement process
    #l=2,r=3
    if l == 1:
        return ac_lst[r-2]
    return ac_lst[r-2] - ac_lst[l-2]
    

def make_ac_lst(s):
    ac_lst = [0] * len(s)
    for i in range(len(s)-1):
        if i != 0:
            ac_lst[i] += ac_lst[i-1]
        if s[i] == "A" and s[i+1] == "C":
            ac_lst[i] += 1
    ac_lst[-1] = ac_lst[-2]

    if _DEB: logd(f"{ac_lst}")
    return ac_lst

def main():
    # input
    n,q = map(int, input().split())
    s = input()
    
    # process
    ans = ""
    ac_lst = make_ac_lst(s)

    for _ in range(q):
        l,r = map(int, input().split())
        ans += str( solve(ac_lst,l,r) ) + "\n"
         
    # output    
    print(ans)
    return ans
        
### DEBUG I/O ###
_DEB = 0   # 1:ON / 0:OFF

_INPUT = """\
8 3
ACACTAAC
7 8
2 3
1 8
"""
_EXPECTED = """\
2
0
3

"""

def logd(str):
    """usage:
    if _DEB: logd(f"{str}")
    """
    if _DEB: print(f"[deb] {str}")

### MAIN ###
if __name__ == "__main__":
    if _DEB:
        sys.stdin = io.StringIO(_INPUT)
        print("!! Debug Mode !!")

    ans = main()

    if _DEB:
        print()
        if _EXPECTED.strip() == ans.strip(): print("!! Success !!")
        else: print(f"!! Failed... !!\nANSWER:   {ans}\nExpected: {_EXPECTED}")
### BUGGY CODE ###

import sys
 
a = []
for l in sys.stdin:
    if l == '\n' or l == '\r':
        break
    else :
        a.append(l)

target = a[int(a[0])]
num = 0
sortedA = []

end = len(a) - 1

for i in range(0, end):
    if i == 0:
        sortedA.append(''.join(sorted(a[1])))
    for j in range(i + 1, end):
        if i == 0:
            sortedA.append(''.join(sorted(a[j + 1])))
        if sortedA[i] == sortedA[j]:
            num = num + 1
print(num)

### FIXED CODE ###

import sys
import collections

n=int(input())
a=[''.join(sorted(input())) for _ in range(n)]

ans = 0
for v in collections.Counter(a).values():
    if v != 1:
        ans += v * (v - 1) // 2
print(ans)
### BUGGY CODE ###

n = int(input()) #1行目のNを取得する
list = [input() for i in range(n)] #複数行の数値の入力を取得
lint = [int(s) for s in list]

for i in range(n):
    a = lint.pop(0)
    ans = max(lint)
    print(ans)
    lint.append(a)

### FIXED CODE ###

n = int(input()) #1行目のNを取得する
list = [input() for i in range(n)] #複数行の数値の入力を取得
lint = [int(s) for s in list]

ans = max(lint)
index = lint.index(max(lint))
lint.remove(max(lint))
ans2 = max(lint)

if ans == ans2:
    for i in range(n):
        print(ans)
else:
    for i in range(0, index):
        print(ans)
    print(ans2)
    for i in range(index+1, n):
        print(ans)
### BUGGY CODE ###

n=int(input())
a=list(map(int,input().split()))
cnt=0
for i in range(n):
  for j in range(n):
    if a[i]==j+1 and a[j]==i+1:
      cnt+=1
    else:
      cnt=cnt
print(cnt//2)
      


### FIXED CODE ###

n=int(input())
a=list(map(int,input().split()))
cnt=0
for i in range(n):
    if a[a[i]-1]==i+1:
      cnt+=1
    else:
      cnt=cnt
print(cnt//2)
### BUGGY CODE ###

from math import gcd
from random import randrange
from itertools import product
from functools import reduce
from operator import mul
from collections import Counter


class PrimeFactor:
    def __init__(self):
        pass

    def is_prime(self, N):
        """ミラーラビン"""
        v = [2, 7, 61] if N < 4_759_123_141 else \
            [2, 3, 5, 7, 11, 13, 17] if N < 341_550_071_728_321 else \
            [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37]
        if N < 2:
            return False
        if N in v:
            return True
        d = N - 1
        s = 0
        while d % 2 == 0:
            d //= 2
            s += 1

        for a in v:
            if pow(a, d, N) != 1:
                ok = True
                for r in range(s):
                    if pow(a, d * 1 << r, N) == N - 1:
                        ok = 0
                        break
                if ok:
                    return False
        return True

    def f(self, x, n, c):
        return (x * x + c) % n

    def get_factor(self, n):
        c = randrange(1, n)
        if n % 2 == 0:
            return 2
        if self.is_prime(n):
            return n
        x = randrange(1, n)
        y, d = x, 1

        while d == 1:
            x = self.f(x, n, c)
            y = self.f(self.f(y, n, c), n, c)
            d = gcd(abs(x - y), n)
        if d == n:
            return self.get_factor(n)
        return self.get_factor(d)

    def factorization(self, N):
        if N == 1:
            return [1]
        arr = []
        while N > 1:
            k = self.get_factor(N)
            cnt = 0
            while N % k == 0:
                cnt += 1
                N //= k
                arr.append(k)
        return arr

    def divisors(self, N):
        if N == 1:
            return [1]
        c = Counter(self.factorization(N))
        mul_list = []
        for i in c:
            tmp = [1] * (c[i] + 1)
            for j in range(c[i]):
                tmp[j + 1] = tmp[j] * i
            mul_list.append(tmp)
        res = [reduce(mul, v) for v in product(*mul_list)]
        return res


p = PrimeFactor()
n = int(input())
ans = 0
for i in range(1, n):
    ans += len(p.divisors(i))
print(ans)


### FIXED CODE ###

from collections import defaultdict
# d = defaultdict(int)で0で初期化
# d = defaultdict(lambda: 100)で100で初期化
MAXN = 10**6 + 10
sieve = [i for i in range(MAXN + 1)]
p = 2
while p * p <= MAXN:
    if sieve[p] == p:
        for q in range(2 * p, MAXN + 1, p):
            if sieve[q] == q:
                sieve[q] = p
    p += 1


def solve(a):
    tmp = defaultdict(int)
    while a > 1:
        tmp[sieve[a]] += 1
        a //= sieve[a]
    ans = 1
    for i in tmp.values():
        ans *= (i + 1)
    return ans


n = int(input())
ans = 0
for i in range(1, n):
    ans += solve(i)
print(ans)
### BUGGY CODE ###

X = int(input())
pos = [0]

for i in range(1,X+1):
	tmp = []
	for j in pos:
		tmp.append(j + i)
		if j + i ==  X:
			print(i)
			exit(0)

	pos.extend(tmp)
	pos = list(set(pos))


### FIXED CODE ###

X = int(input())

sumval = 0
for i in range(1,X+1):
	sumval += i
	if sumval >= X:
		ans = i
		break

print(ans)
### BUGGY CODE ###


def main():
    buf = input()
    N = int(buf)
    if N % 2 == 0:
        print(N // 2, N, N)
        return
    else:
        divisor = N
        mult = 1
        while True:
            prime_factor = prime_factorization(divisor)
            for h in prime_factor:
                for n in prime_factor:
                    for w in prime_factor:
                        if h + n + w == 4 * mult:
                            print(divisor // h, divisor // n, divisor // w)
                            return
            divisor += N
            mult += 1

def prime_factorization(number):
    n = number
    i = 2
    factor = {1: 1}
    while i * i <= n:
        while n % i == 0:
            if i in factor:
                factor[i] += 1
            else:
                factor.update({i : 1})
            n //= i
        i += 1
    if n > 1 or not factor:
        if n in factor:
            factor[n] += 1
        else:
            factor.update({n : 1})
    return factor

if __name__ == '__main__':
    main()


### FIXED CODE ###

def main():
    buf = input()
    N = int(buf)
    if N % 2 == 0:
        print(N // 2, N, N)
        return
    else:
        divisor = N
        mult = 1
        while True:
            factor = factorization(divisor)
            for h in factor:
                for n in factor:
                    for w in factor:
                        if h + n + w == 4 * mult:
                            print(divisor // h, divisor // n, divisor // w)
                            return
            divisor += N
            mult += 1

def factorization(number):
    i = 2
    factor = {1, number}
    while i * i <= number:
        if number % i == 0:
            factor.add(i)
            factor.add(number // i)
        i += 1
    return factor

if __name__ == '__main__':
    main()
### BUGGY CODE ###

N = int(input())
A = list(map(int, input().split()))


# number_to_prime[i]: i の最小の素因数, iが素数ならば0
number_to_prime = [0] * (10**6 + 1)

# preprocess
for i in range(2, 10**6+1):
    if not number_to_prime[i]:
        j = 1
        while j*i <= 10**6:
            number_to_prime[j*i] = i
            j += 1


def is_pairwise():
    used_primes = set()
    pairwise_flag = 1
    for a in A:
        if a == 1:
            continue
        curr_primes = set()
        while number_to_prime[a] > 1:
            prime = number_to_prime[a]
            curr_primes.add(prime)
            a //= prime
        if used_primes & curr_primes:
            pairwise_flag = 0
            break
        else:
            used_primes = used_primes | curr_primes
    return pairwise_flag

def is_setwise(*A):
    import math
    from functools import reduce

    return reduce(math.gcd, A) == 1

if is_pairwise():
    print("pairwise coprime")
elif is_setwise(*A):
    print("setwise coprime")
else:
    print("not coprime")

### FIXED CODE ###

N = int(input())
A = list(map(int, input().split()))


# number_to_prime[i]: i の最小の素因数, iが素数ならば0
number_to_prime = [0] * (10**6 + 1)

# preprocess
for i in range(2, 10**6+1):
    if not number_to_prime[i]:
        j = 1
        while j*i <= 10**6:
            number_to_prime[j*i] = i
            j += 1

def is_pair_copr(A):
    import numpy as np
    U = 1 << 20
    div_p = np.arange(U)
    for p in range(2, U):
        if div_p[p] != p:
            continue
        div_p[p::p] = p
    used = np.zeros(U, np.bool_)
 
    for x in A:
        while x > 1:
            p = div_p[x]
            while x % p == 0:
                x //= p
            if used[p]:
                return False
            used[p] = True
    return True

def is_pairwise():
    used_primes = set()
    pairwise_flag = 1
    for a in A:
        curr_primes = set()
        while a > 1:
            prime = number_to_prime[a]
            curr_primes.add(prime)
            a //= prime
        if used_primes & curr_primes:
            pairwise_flag = 0
            break
        else:
            used_primes = used_primes | curr_primes
    return pairwise_flag

def is_setwise(*A):
    import math
    from functools import reduce

    return reduce(math.gcd, A) == 1

if is_pair_copr(A):
    print("pairwise coprime")
elif is_setwise(*A):
    print("setwise coprime")
else:
    print("not coprime")
### BUGGY CODE ###

import collections
n = int(input())
ls = [input() for i in range(n)]    
c = collections.Counter(ls)
count = c.most_common()[0][1]
ans = []
if c.most_common()[0][1] == 1:
    ls.sort()
    for i in ls:
        print(i)
else:
    for i in range(len(c)):
        p = c.most_common()
        if p[i][1] == count:
            ans.append(p[i][0])
        else:
            break   
    ans = sorted(ans)
    for i in ans:
      print(i)

### FIXED CODE ###

import collections
from collections import Counter

n = int(input())
ls = [input() for i in range(n)]    
c = Counter(ls).most_common()

count = c[0][1]
ans = []

for i in range(len(c)):
    if c[i][1] == count:
        ans.append(c[i][0])
    else:
        break   
ans = sorted(ans)
for i in ans:
    print(i)
### BUGGY CODE ###

import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from itertools import combinations_with_replacement 
from heapq import heapify, heappop, heappush
def main():
    s = readline().rstrip().decode()
    K = int(readline())
    N = len(s)
    p = [int(i) for i in range(N)]
    hp = []
    heapify(hp)
    #K番目のsubsitringは長さがK以下のsubstrigの集合に必ず含まれる
    #K<=5であるから列挙される要素数は最大でも26^5(およそ10,000,000)
    for l, r in combinations_with_replacement(p, 2):
        sub = s[l:r+1]
        ln = len(sub)
        if ln <= K:  
            heappush(hp, sub)
    S = set()
    while len(hp)>0:
        v = heappop(hp)
        S.add(v)
        if len(S) == K:
            print(v)
            return 
if __name__ == '__main__':
    main()


### FIXED CODE ###

import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(1000000)

def main():
    s = readline().rstrip().decode()
    K = int(readline())
    #sに含まれる文字を一文字ずつ抽出する.
    #ここで抽出した文字を組み合わせて辞書順に文字列を構成していく
    #K<=5だから高々26^5個の文字列を構成することになる
    l = sorted(list(set(s)))
    #cnd:=構成した文字列を辞書順に格納するリスト
    cnd = []
    #f(sub):=subから構成可能なK文字以下のSの部分文字列を構成する関数
    def f(sub):
        cnd.append(sub)
        if len(sub) < K: 
            #lから選んでsubに一文字追加する
            for i in l:
                nx = sub+i
                if nx in s:
                    f(nx)
    for i in l:
        f(i) 
    print(cnd[K-1])
if __name__ == '__main__':
    main()
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10**6)
def rec(i,j):
    res=0
    if(dp[i][j]>=0):
        return dp[i][j]
    if(i==n):
        res=0
    elif(j<w[i]):
        res=rec(i+1,j)
    else:
        res=max(rec(i+1,j),rec(i+1,j-w[i])+v[i])
    dp[i][j]=res
    return res
n,x=map(int,input().split())
dp=[[-1]*(x+10) for i in range(n+10)]
w,v=[],[]
for i in range(n):
    a,b=map(int,input().split())
    w.append(a);v.append(b)
print(rec(0,x))

### FIXED CODE ###

N,W=map(int,input().split())
weight=[0]*N
value=[0]*N
for i in range(N):
    weight[i],value[i]=map(int,input().split())
dp=[[0]*(W+1) for i in range(N+1)]
for i in range(N):
    for j in range(W+1):
        if(j>=weight[i]):
            dp[i+1][j]=max(dp[i][j-weight[i]]+value[i],dp[i][j])
        else:
            dp[i+1][j]=dp[i][j]
print(dp[N][W])
### BUGGY CODE ###

from collections import Counter
n = int(input())
s = [tuple(sorted(list(input()))) for _ in range(n)]
ans = 0
st = []
count = {}

for i in range(n):
    if not s[i] in st:
        st += [s[i]]
        count[s[i]] = 0
    elif s[i] in st:
        count[s[i]] += 1
        ans += count[s[i]]

print(ans)

### FIXED CODE ###

from collections import Counter
n = int(input())
s = [tuple(sorted(input())) for _ in range(n)]

c = Counter(s)
ans = 0
for i in c.values():
    ans += i*(i-1)//2
print(ans)
### BUGGY CODE ###

from bisect import bisect_left as bl
from itertools import accumulate as ac
n,m=map(int,input().split())
a=sorted(list(map(int,input().split())))
s=[0]+list(ac(a[::-1]))
l,r=2*a[-1]*(n**2)+1,0
while l-r>1:
    t=(l+r)//2
    p=0
    for i in range(n):
        x=bl(a,t-a[i])
        p+=n-x
    if p<m:
        l=t
    else:
        r=t
c,d=0,0
w=0
for i in range(n):
    g=bl(a,r-a[i])
    x=n-g
    c+=s[x]+x*a[i]
    w+=x
print(c-r*max(0,(w-m)))

### FIXED CODE ###

from bisect import bisect_left as bl
from itertools import accumulate as ac
n,m=map(int,input().split())
a=sorted(list(map(int,input().split())))
s=[0]+list(ac(a[::-1]))
l,r=2*a[-1]*(n**2)+1,0
while l-r>1:
    t=(l+r)//2
    p=0
    for i in range(n-1,-1,-1):
        if a[i]+a[-1]>=t:
            x=bl(a,t-a[i])
            p+=n-x
        else:
            break
    if p<m:
        l=t
    else:
        r=t
c,d=0,0
w=0
for i in range(n-1,-1,-1):
    if a[i]+a[-1]>=r:
        g=bl(a,r-a[i])
        x=n-g
        c+=s[x]+x*a[i]
        w+=x
    else:
        break
print(c-r*max(0,(w-m)))
### BUGGY CODE ###

import copy
import math
n, k = map(int, input().split())
a = list(map(int, input().split()))
b = [0] * n
if k < 41:
    for _ in range(k):
        for i in range(n):
            light = 0
            for j in range(n):
                if i < j:
                    if (j - a[j] - 0.5) < i:
                        light += 1
                else:
                    if (j + a[j] + 0.5) > i:
                        light += 1
            b[i] = light
        a = copy.deepcopy(b)
else:
    for _ in range(41):
        for i in range(n):
            light = 0
            for j in range(n):
                if i < j:
                    if (j - a[j] - 0.5) < i:
                        light += 1
                else:
                    if (j + a[j] + 0.5) > i:
                        light += 1
            b[i] = light
        a = copy.deepcopy(b)
for i in a:
    print(i, end=' ')

### FIXED CODE ###

# ac
import sys
import numpy as np
from numba import njit

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

@njit('(i8[::1],)', cache=True)
def update(a):
    n = len(a)
    b = np.zeros_like(a)       # aと同じ形状の配列を生成(https://deepage.net/features/numpy-zeros.html)
    for i, x in enumerate(a):  # enumerateはindex, valueを返す
        l = max(0, i - x)      # lampの照らす範囲の下限（左側）
        r = min(n - 1, i + x)  # lampの上限（右側）
        b[l] += 1              # 以下imos法
        if r + 1 < n:          # r+1はx=nの時（最後のサイクル）r+1=nでindexの指定に失敗するから弾く（indexは0~n-1）
            b[r + 1] -= 1
    b = np.cumsum(b)           # bの要素の累積和（フィボナッチ数列みたいな）（imos法の締め）
    return b


n, k = map(int, readline().split())
a = np.array(read().split(), np.int64)

k = min(k, 41)                 # 今回の制限範囲のnなら41回も試行すればaの値が全て上限に達するのでそれ以上の試行は不要（解説PDF）
for _ in range(k):
    a = update(a)
print(' '.join(map(str, a)))   # joinメソッドはstrを''で区切って連結する
### BUGGY CODE ###

N = int(input())
candi =int((N+1)/2*N -N)
if N%2 == 0:
    an = [ i for i in range(1,N+1)]
    an.reverse()
    nex_num = N
    count =0
    for i in an:
        if nex_num == i:
            nex_num = (i//2) + 1
            count += (i%nex_num) #next_numを割るところに使う
            nex_num = nex_num -1
        else:
            count += i #前の大きい数を使用する
else:
    an = [ i for i in range(1,N+1)]
    an.reverse()
    nex_num = N
    count =0
    for i in an:
        if nex_num == i:
            nex_num = (i+1)//2
            count += (i%nex_num) #next_numを割るところに使う
            nex_num = nex_num -1
        else:
            count += i #前の大きい数を使用する
if candi > count:
    print(candi)
else:
    print(count)

### FIXED CODE ###

N = int(input())
print((N-1)*N//2)