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

while True:
    #n,m = list(map(int,input().split()))
    #spam = input()


    print(1)

### FIXED CODE ###

while True:
    try:
        n,m = list(map(int,input().split()))
        if n == 0 and m == 0:
            break
        amari = n % m
        yasai = list(map(int,input().split())) 
        yasai.sort()

        s = 0
        for i in range(n):
            if (i+1) % m > 0:
                s += yasai[-i-1]
        print(s)
    except:
        pass
### BUGGY CODE ###

from itertools import combinations

n = int(input())
S = []

for _ in range(n):
  s = input()
  if s[0] in set(['M','A','R','C','H']):
    S.append(s[0]) 
  
print(sum([1 for pattern_i in combinations(S, 3) if len(set(pattern_i))==3]))

### FIXED CODE ###

from itertools import combinations
from collections import Counter

n = int(input())
c = Counter()

for _ in range(n):
  c[input()[0]]+= 1
  
ans = sum([c[pattern_i[0]]*c[pattern_i[1]]*c[pattern_i[2]] for pattern_i in combinations(['M','A','R','C','H'], 3)])
print(ans)
### BUGGY CODE ###

n,k,q=(map(int,input().split()))
l=[int(input()) for i in range(q)]
x=len(l)
for i in range(1,n+1):
    print("Yes" if k-(x-l.count(i))>0 else "No")

### FIXED CODE ###

n,k,q=map(int, input().split())
p=[-q+k]*n
for i in range(0,q):
    p[int(input())-1]+=1
for i in range(0,n):
    print("Yes" if p[i]>0 else "No")
### BUGGY CODE ###

from bisect import bisect_left
n = int(input())
ans = [int(input())]
for i in range(n-1):
    now = int(input())
    j = bisect_left(ans,now)
    if j == 0:
        ans = [now] + ans
    else:
        ans[j-1] = now

print(len(ans))

### FIXED CODE ###

def bisect_right(a, x, lo=0, hi=None):
    """Return the index where to insert item x in list a, assuming a is sorted.

    The return value i is such that all e in a[:i] have e <= x, and all e in
    a[i:] have e > x.  So if x already appears in the list, a.insert(x) will
    insert just after the rightmost x already there.

    Optional args lo (default 0) and hi (default len(a)) bound the
    slice of a to be searched.
    """

    if lo < 0:
        raise ValueError('lo must be non-negative')
    if hi is None:
        hi = len(a)
    while lo < hi:
        mid = (lo+hi)//2
        if x < a[mid]: hi = mid
        else: lo = mid+1
    return lo

n = int(input())
f = int(input())
ans = [-f]
for i in range(n-1):
    now = -int(input())
    j = bisect_right(ans,now)
    if j == len(ans):
        ans.append(now)
    else:
        ans[j] = now

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

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

# 入力を整数に変換して受け取る
def input_int():
    return int(input())


# マイナス1した値を返却
def int1(x):
    return int(x) - 1


# 半角スペース区切り入力をIntに変換してMapで受け取る
def input_to_int_map():
    return map(int, input().split())


# 半角スペース区切り入力をIntに変換して受け取る
def input_to_int_tuple():
    return tuple(map(int, input().split()))


# 半角スペース区切り入力をIntに変換してマイナス1した値を受け取る
def input_to_int_tuple_minus1():
    return tuple(map(int1, input().split()))


def main():
    n, k = input_to_int_map()
    a = {i + 1: int(val) for i, val in enumerate(input().split())}

    place = 1
    visit = {place}
    place_visits = [place]
    for i in range(k):
        place = a[place]
        if place in place_visits:
            left = place_visits.index(place)
            loop_list = place_visits[left:]
            return loop_list[(k - left) % len(loop_list)]
        else:
            visit.add(place)
            place_visits.append(place)

    return place


if __name__ == "__main__":
    print(main())


### FIXED CODE ###

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

# 入力を整数に変換して受け取る
def input_int():
    return int(input())


# マイナス1した値を返却
def int1(x):
    return int(x) - 1


# 半角スペース区切り入力をIntに変換してMapで受け取る
def input_to_int_map():
    return map(int, input().split())


# 半角スペース区切り入力をIntに変換して受け取る
def input_to_int_tuple():
    return tuple(map(int, input().split()))


# 半角スペース区切り入力をIntに変換してマイナス1した値を受け取る
def input_to_int_tuple_minus1():
    return tuple(map(int1, input().split()))


def main():
    n, k = input_to_int_map()
    a = {i + 1: int(val) for i, val in enumerate(input().split())}

    place = 1
    visit = {place}
    place_visits = [place]
    for i in range(k):
        place = a[place]
        if place in visit:
            left = place_visits.index(place)
            return place_visits[left + (k - left) % (i + 1 - left)]
        else:
            visit.add(place)
            place_visits.append(place)

    return place


if __name__ == "__main__":
    print(main())
### BUGGY CODE ###

#!/usr/bin/env python3
import sys


def solve(N: int, M: int, K: int, A: "List[int]", B: "List[int]"):
    a = 0
    a_n = [a]
    for a_i in A:
        a += a_i
        a_n.append(a)

    b = 0
    b_n = [b]
    for b_i in B:
        b += b_i
        b_n.append(b)
    b_n = b_n[::-1]

    maxs = []
    max_j = M
    for i, a in enumerate(a_n):
        for j, b in enumerate(b_n[-(max_j+1):]):
            if b <= (K-a):
                maxs.append(i+max_j-j)
                max_j -= j
                break

    return max(maxs)


# Generated by 1.1.7.1 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    M = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [int(next(tokens)) for _ in range(N)]  # type: "List[int]"
    B = [int(next(tokens)) for _ in range(M)]  # type: "List[int]"
    print(solve(N, M, K, A, B))

if __name__ == '__main__':
    main()


### FIXED CODE ###

#!/usr/bin/env python3
import sys


def solve(N: int, M: int, K: int, A: "List[int]", B: "List[int]"):
    a = 0
    a_n = [a]
    for a_i in A:
        a += a_i
        a_n.append(a)

    b = 0
    b_n = [b]
    for b_i in B:
        b += b_i
        b_n.append(b)

    ans = 0
    j = M
    for i, a in enumerate(a_n):
        if a > K:
            break
        while b_n[j] > (K-a):
            j -= 1
        ans = max(ans, i+j)

    return ans


# Generated by 1.1.7.1 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    M = int(next(tokens))  # type: int
    K = int(next(tokens))  # type: int
    A = [int(next(tokens)) for _ in range(N)]  # type: "List[int]"
    B = [int(next(tokens)) for _ in range(M)]  # type: "List[int]"
    print(solve(N, M, K, A, B))

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

N,K = map(int,input().split())
a = abs(N-K)
while True:
    c = abs(N-K)
    if c > a: break
    a = c
    N = c
print(a)

### FIXED CODE ###

N,K = map(int, input().split())
N = N%K
absolute = abs(K-N)
print(absolute if absolute < N else N)
### BUGGY CODE ###

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

#############
# Libraries #
#############

import sys
input = sys.stdin.readline

N = int(input())
S = list(input())
Q = int(input())


alphabet = "abcdefghijklmnopqrstuvwxyz"

bag = { l:[] for l in alphabet}

for i in range(N):
  bag[S[i]].append(i+1)


import bisect

for _ in range(Q):
  t,a,b = input().split()
  a = int(a)
  if int(t) == 1:
    bag[S[a-1]].remove(a)
    S[a-1] = b
    bisect.insort(bag[b],a)
  else:
    count = 0
    b = int(b)
    for l in alphabet:
      if len(bag[l])>0:
        left = bisect.bisect_left(bag[l],a)
        if left != len(bag[l]):
          if bag[l][left] <= b:
            count += 1
    print(count)


### FIXED CODE ###

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

#############
# Libraries #
#############

import sys
input = sys.stdin.readline

N = int(input())
S = list(input())
Q = int(input())


alphabet = "abcdefghijklmnopqrstuvwxyz"

bag = { l:[] for l in alphabet}

for i in range(N):
  bag[S[i]].append(i+1)


import bisect

for _ in range(Q):
  t,a,b = input().split()
  a = int(a)
  if int(t) == 1:
    if S[a-1]!=b:
      bag[S[a-1]].remove(a)
      S[a-1] = b
      bisect.insort(bag[b],a)
  else:
    count = 0
    b = int(b)
    for l in alphabet:
      if len(bag[l])>0:
        left = bisect.bisect_left(bag[l],a)
        if left != len(bag[l]):
          if bag[l][left] <= b:
            count += 1
    print(count)
### BUGGY CODE ###

import math
#import numpy as np
import queue
from collections import deque,defaultdict
import heapq as hpq
from sys import stdin,setrecursionlimit
#from scipy.sparse.csgraph import dijkstra
#from scipy.sparse import csr_matrix
ipt = stdin.readline
setrecursionlimit(10**7)

def main():
    n = int(ipt())
    a = [int(i) for i in ipt().split()]
    al = [0]*(max(a)+1)
    a.sort()
    ans = 0
    pi = 0
    for i in a:
        if al[i] == 0:
            ans += 1
            na = i
            while na <= max(a):
                al[na] = 1
                na += i
            pi = i
        else:
            if i == pi:
                ans -= 1
                pi = 0


    print(ans)

    return

if __name__ == '__main__':
    main()


### FIXED CODE ###

import math
#import numpy as np
import queue
from collections import deque,defaultdict
import heapq as hpq
from sys import stdin,setrecursionlimit
#from scipy.sparse.csgraph import dijkstra
#from scipy.sparse import csr_matrix
ipt = stdin.readline
setrecursionlimit(10**7)

def main():
    n = int(ipt())
    a = [int(i) for i in ipt().split()]
    a.sort()
    ma = max(a)+1
    al = [True]*ma
    ans = 0
    pi = 0
    for i in a:
        if al[i]:
            ans += 1
            for j in range(i,ma,i):
                al[j] = False
            pi = i
        else:
            if i == pi:
                ans -= 1
                pi = 0

    print(ans)

    return

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

from functools import lru_cache


def popcnt(x):
    return bin(x).count("1")


@lru_cache(maxsize=None)
def rec(n):
    if n == 0:
        return 0
    else:
        return rec(n % popcnt(n)) + 1


n = int(input())
arr = input()

cnt = popcnt(int(arr, 2))
init_big = int(arr, 2) % (cnt + 1)
if cnt == 1:
    init_small = 0
else:
    init_small = int(arr, 2) % (cnt - 1)

li = [0] * n
for i in range(n):
    if arr[i] == "0":
        li[i] = (init_big + (1 << (n - i - 1))) % (cnt + 1)
    elif int(arr[:i] + str(1 ^ int(arr[i])) + arr[i + 1:], 2) == 0 or cnt - 1 == 0:
        li[i] = "flg"
    else:
        li[i] = (init_small - (1 << (n - i - 1))) % (cnt - 1)


ans = []

for x in li:
    if x == "flg":
        ans.append(0)
    else:
        ans.append(rec(x) + 1)

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

### FIXED CODE ###

from functools import lru_cache


def popcnt(x):
    return bin(x).count("1")


@lru_cache(maxsize=None)
def rec(n):
    if n == 0:
        return 0
    else:
        return rec(n % popcnt(n)) + 1


ret = [rec(x) for x in range(2 * 10**5 + 1)]


n = int(input())
arr = input()

ALL_ARR = int(arr, 2)

cnt = popcnt(int(arr, 2))
init_big = ALL_ARR % (cnt + 1)
if cnt == 1:
    init_small = 0
else:
    init_small = ALL_ARR % (cnt - 1)


li = [0] * n
for i in range(n):
    if arr[i] == "0":
        li[i] = (init_big + pow(2, n - i - 1, cnt + 1)) % (cnt + 1)
    elif ALL_ARR - (1 << (n - i - 1)) == 0 or cnt - 1 == 0:
        li[i] = "flg"
    else:
        li[i] = (init_small - pow(2, n - i - 1, cnt - 1)) % (cnt - 1)


ans = []

for x in li:
    if x == "flg":
        ans.append(0)
    else:
        ans.append(ret[x] + 1)

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

import sys

S = input()

while len(S) > 0:
    if len(S) < 5:
        print('NO')
        sys.exit(0)
    third = S[-3]
    if third == 'e':
        if len(S) < 5 or S[-5:] != 'dream':
            print('NO')
            sys.exit(0)
        S = S[:-5]
    if third == 'a':
        if len(S) < 5 or S[-5:] != 'erase':
            print('NO')
            sys.exit(0)
        S = S[:-5]
    if third == 'm':
        if len(S) < 7 or S[-7:] != 'dreamer':
            print('NO')
            sys.exit(0)
        S = S[:-7]
    if third == 's':
        if len(S) < 6 or S[-6:] != 'eraser':
            print('NO')
            sys.exit(0)
        S = S[:-6]

print('YES')

### FIXED CODE ###

import sys

S = input()

while len(S) > 0:
    if len(S) < 5:
        print('NO')
        sys.exit(0)
    third = S[-3]
    if third == 'e':
        if len(S) < 5 or S[-5:] != 'dream':
            print('NO')
            sys.exit(0)
        S = S[:-5]
        continue
    if third == 'a':
        if len(S) < 5 or S[-5:] != 'erase':
            print('NO')
            sys.exit(0)
        S = S[:-5]
        continue
    if third == 'm':
        if len(S) < 7 or S[-7:] != 'dreamer':
            print('NO')
            sys.exit(0)
        S = S[:-7]
        continue
    if third == 's':
        if len(S) < 6 or S[-6:] != 'eraser':
            print('NO')
            sys.exit(0)
        S = S[:-6]
        continue
    else:
        print('NO')
        sys.exit(0)

print('YES')
### BUGGY CODE ###

import bisect
alp = 'abcdefghijklmnopqrstuvwxyz'
alp_dict = {s:i for i, s in enumerate('abcdefghijklmnopqrstuvwxyz')}
N = len(alp)
S = input()
K = int(input())
ans = ''
for s in S:
  i = alp_dict[s]
  if K>=N-i:
    ans += 'a'
    K -= N-i
  else:
    ans += s
if K == 0:
  print(ans)
else:
  K = K%N
  last_s = alp[(alp_dict[ans[-1]]+K)%N]
  print(ans[:-1] + last_s)


### FIXED CODE ###

S = input()
K = int(input())
alp = '0bcdefghijklmnopqrstuvwxyza'
alp_dict = {s:i for i,s in enumerate(alp)}


cnt = 0
ans = ''
for i,s in enumerate(S):
  if cnt + (26-alp_dict[s]) <= K:
    cnt += (26-alp_dict[s])
    ans += 'a'
  else:
    ans += s

if (K-cnt)%26==0:
  print(ans)
else:
  rest = (K-cnt)%26
  print(ans[:-1]+alp[(alp_dict[ans[-1]]+rest)%26])
### BUGGY CODE ###

H, N = map(int, input().split())

AB = []
for i in range(N):
    tmp = list(map(int, input().split()))
    AB.append(tmp)
    
dp = [10**9] * (H+1)
dp[0] = 0
    
for i in range(N):
    for j in range(H+1):
        a, b = AB[i]
        if j < a:
            dp[j] = min(dp[0]+b, dp[j])
        else:
            dp[j] = min(dp[j-a]+b, dp[j])
    
print(dp[H])


### FIXED CODE ###

H, N = map(int, input().split())

AB = []
for i in range(N):
    tmp = list(map(int, input().split()))
    AB.append(tmp)
    
dp = [10**9] * (H+1)
dp[0] = 0
    
for i in range(N):
    for j in range(H+1):
        a, b = AB[i]
        if j < a:
            dp[j] = min(dp[0]+b, dp[j])
        else:
            dp[j] = min(dp[j-a]+b, dp[j])
    
print(dp[H])
### BUGGY CODE ###

#coding:utf-8

N = int(input())
A = [int(i) for i in input().split()]
ans = N
left = 0
right = 0

for i in range(N):
    left ^= A[i]
    right += A[i]
    for j in range(i + 1, N):
        left ^= A[j]
        right += A[j]
        if left == right:
            ans += 1
    left = 0
    right = 0

print(ans)

### FIXED CODE ###

#coding:utf-8

N = int(input())
A = [int(i) for i in input().split()]
ans = 0
formula1 = 0
formula2 = 0
lastRight = 0

for left in range(N):
    rightOut = False
    if left > 0:
        formula1 ^= A[left - 1]
        formula2 -= A[left - 1]
    for right in range(lastRight, N):
        formula1 ^= A[right]
        formula2 += A[right]
        if formula1 != formula2:
            rightOut = True
            formula1 ^= A[right]
            formula2 -= A[right]
            break

    lastRight = max(left, right - rightOut) + 1
    ans += lastRight - left
print(ans)
### BUGGY CODE ###

n = int(input())
ls_a = list(map(int,input().split()))

for i in range(1,n+1):
    count = 0
    for j in ls_a:
        if i == j:
            count += 1
    print(count)

### FIXED CODE ###

n = int(input())
ls_a = list(map(int,input().split()))
ls = [0]*n
for i in ls_a:
    ls[i-1] += 1

for i in ls:
    print(i)
### BUGGY CODE ###

n = int(input())
a = list(map(int, input().split()))
q = int(input())

b = []
c = []
for i in range(q):
	B, C = map(int, input().split())
	b.append(B)
	c.append(C)

a1 = []
a2 = []

for i in a:
	if i in a1:
		a2[a1.index(i)]+=1
	else:
		a1.append(i)
		a2.append(1)

ans = []
s = 0

for i in range(len(a1)):
	s += a1[i]*a2[i]

ans.append(s)

for i in range(q):
	if b[i] in a1:
		bi = a1.index(b[i])
		if c[i] in a1:
			a2[a1.index(c[i])]+=a2[bi]
			ans.append(ans[-1]+a2[bi]*(c[i]-b[i]))
			a2[bi] = 0
		else:
			a1.append(c[i])
			a2.append(a2[bi])
			ans.append(ans[-1]+a2[bi]*(c[i]-b[i]))
			a2[bi] = 0
	else:
		ans.append(ans[-1])

for i in range(len(ans)-1):
	print(ans[i+1])

### FIXED CODE ###

from collections import Counter

n = int(input())
a = list(map(int, input().split()))
q = int(input())

cnt = Counter(a)

s = sum(a)

for i in range(q):
	b, c = map(int, input().split())
	s = s - b*cnt[b]
	s = s + c*cnt[b]
	cnt[c] += cnt[b]
	cnt[b] = 0
	print(s)
### BUGGY CODE ###

dict=[]
n=int(raw_input())
for i in range(n):
	list=raw_input().split()
	if list[0]=='insert':
		dict.append(list[1])
	elif list[0]=='find':
		try:
			dict.index(list[1])
			print 'yes'
		except:
			print 'no'

### FIXED CODE ###

n=int(raw_input())
a={}
for i in range(n):
	inst,key=raw_input().split()
	if inst=='insert': 
		a.update({key:i})
	elif inst=='find': 
		if a.has_key(key)==True:
			 print 'yes'
		else:print 'no'
### BUGGY CODE ###

N,K,Q=map(int,input().split())
listA=[int(input()) for i in range(Q)]
listK=[K for i in range(N)]
for i in listA:
	for j in range(0,N):
		if i !=j:
			listK[j-1]=listK[j-1]-1
for i in range(1,N+1):
	print('Yes' if listK[i-1]>0 else 'No')

### FIXED CODE ###

n,k,q=map(int,input().split())
plis=[0]*n
for i in range(q):
	a=int(input())
	plis[a-1]+=1
for i in range(n):
	if plis[i]>q-k:
		print("Yes")
	else:
		print("No")
### BUGGY CODE ###

from collections import defaultdict
H, W, M = map(int, input().split())
d = defaultdict(int)
tate = [0 for i in range(H+1)]
yoko = [0 for i in range(W+1)]
for i in range(M):
    x, y = map(int, input().split())
    d[(x, y)] = 1
    tate[x] += 1
    yoko[y] += 1

ans = 0
T = []
Y = []
for i, v in enumerate(tate):
    T.append((v, i))
for i, v in enumerate(yoko):
    Y.append((v, i))
T.sort(reverse=True)
Y.sort(reverse=True)

if len(T) == 1 or len(Y) == 1:
    for value, index in T:
        for Value, Index in Y:
            if (index, Index) in d.keys():
                ans = max(ans, value+Value-1)
            else:
                ans = max(ans, value+Value)
    print(ans)

else:
    M = T[0][0]+Y[0][0] - 1
    value_t = T[0][0]
    value_y = Y[0][0]
    for value, index in T:
        if value < value_t:
            break
        for Value, Index in Y:
            if Value < value_y:
                break
            if (index, Index) in d.keys():
                ans = max(ans, value+Value-1)
            else:
                ans = max(ans, value+Value)
    print(ans)

### FIXED CODE ###

from collections import defaultdict
H, W, M = map(int, input().split())
d = defaultdict(int)
tate = [0 for i in range(H+1)]
yoko = [0 for i in range(W+1)]
for i in range(M):
    x, y = map(int, input().split())
    d[(x, y)] = 1
    tate[x] += 1
    yoko[y] += 1

ans = 0
T = []
Y = []
for i, v in enumerate(tate):
    T.append((v, i))
for i, v in enumerate(yoko):
    Y.append((v, i))
T.sort(reverse=True)
Y.sort(reverse=True)

value_t = T[0][0]
value_y = Y[0][0]
cnt_t = 0
cnt_y = 0
for value, index in T:
    if value == value_t:
        cnt_t += 1

for Value, Index in Y:
    if Value == value_y:
        cnt_y += 1
if cnt_t*cnt_y > M:
    print(value_t+value_y)

else:
    M = T[0][0]+Y[0][0] - 1
    value_t = T[0][0]
    value_y = Y[0][0]
    for value, index in T:
        if value < value_t:
            break
        for Value, Index in Y:
            if Value < value_y:
                break
            if (index, Index) in d.keys():
                ans = max(ans, value+Value-1)
            else:
                ans = max(ans, value+Value)
    print(ans)
### BUGGY CODE ###

h,w=map(int, input().split())
a=[[i for i in input()] for j in range(h)]
q=[]
ans=-1
for i in range(h):
    for j in range(w):
        if(a[i][j]=="#"):
            q.append([i,j])
while len(q)>0:
    tl=q.copy()
    q=[]
    for i in tl:
        y=i[0]
        x=i[1]
        if(y>0):
            if(a[y-1][x]=="."):
                a[y-1][x]="#"
                q.append([y-1,x])
        if(x>0):
            if(a[y][x-1]=="."):
                a[y][x-1]="#"
                q.append([y,x-1])
        if(y<h-1):
            if(a[y+1][x]=="."):
                a[y+1][x]="#"
                q.append([y+1,x])
        if(x<w-1):
            if(a[y][x+1]=="."):
                a[y][x+1]="#"
                q.append([y,x+1])
    ans+=1
print(ans)

### FIXED CODE ###

h,w=map(int, input().split())
a=[[i for i in input()] for j in range(h)]
q=[]
ans=-1
for i in range(h):
    for j in range(w):
        if(a[i][j]=="#"):
            q.append([i,j])
while len(q)>0:
    tl=q
    q=[]
    for i in tl:
        y=i[0]
        x=i[1]
        if(y>0):
            if(a[y-1][x]=="."):
                a[y-1][x]="#"
                q.append([y-1,x])
        if(x>0):
            if(a[y][x-1]=="."):
                a[y][x-1]="#"
                q.append([y,x-1])
        if(y<h-1):
            if(a[y+1][x]=="."):
                a[y+1][x]="#"
                q.append([y+1,x])
        if(x<w-1):
            if(a[y][x+1]=="."):
                a[y][x+1]="#"
                q.append([y,x+1])
    ans+=1
print(ans)
### BUGGY CODE ###

n = int(input())
A, B = [], []

for i in range(n):
    a, b = map(int, input().split())
    A.append([a, i])
    B.append([b, i])

A = sorted(A, key = lambda x: x[0])
B = sorted(B, key = lambda x: x[0])
flag = [0] * n
sum_t, sum_a = 0, 0

def search_num(l):
    ret = 0
    while flag[l[-1 - ret][1] - 1] == 1:
        ret += 1
    
    return ret

for i in range(n):
    if i % 2 == 0:
        index = search_num(A)
        sum_t += A[-1 - index][0]
        flag[A[-1 - index][1] - 1] = 1
    else:
        index = search_num(B)
        sum_a += B[-1 - index][0]
        flag[B[-1 - index][1] - 1] = 1

print(sum_t - sum_a)

### FIXED CODE ###

n = int(input())
point = [0] * n
total_b = 0
for i in range(n):
    a, b = map(int, input().split())
    point[i] = a + b
    total_b += b

point.sort(reverse = True)

sum_t = 0
for i in range(n):
    if i % 2 == 0:
        sum_t += point[i]

print(sum_t - total_b)
### BUGGY CODE ###

import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

INF = 2**30
n = int(input())
P = list(map(int, input().split()))
T = [[] for _ in range(n)]
for i, p in enumerate(P, 1):
  T[p-1].append(i)
X = list(map(int, input().split()))
D = [-1]*n
def dfs(v):
  if D[v] != -1:
    return D[v]
  l = len(T[v])
  x = X[v]
  dp = [INF]*(x+1)
  dp[0] = 0
  for i, nv in enumerate(T[v]):
    k = [INF]*(x+1)
    for j in range(x+1):
      if j >= X[nv]:
        k[j] = min(k[j], dp[j-X[nv]]+dfs(nv))
      if j >= dfs(nv):
        k[j] = min(k[j], dp[j-dfs(nv)]+X[nv])
    dp = k.copy()
  res = min(dp)
  D[v] = res
  return res
ans = dfs(0)
if ans == INF:
  print("IMPOSSIBLE")
else:
  print("POSSIBLE")

### FIXED CODE ###

import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**7)

n = int(input())
P = list(map(int, input().split()))
T = [[] for _ in range(n)]
for i, p in enumerate(P, 1):
  T[p-1].append(i)
X = list(map(int, input().split()))
D = [[-1]*n for _ in range(2)]
def dfs(color, v):
  if D[color][v] != -1:
    return D[color][v]
  l = len(T[v])
  x = X[v]
  dp = [[float("inf")]*(x+1) for _ in range(l+1)]
  dp[0][0] = 0
  for i, nv in enumerate(T[v]):
    for j in range(x+1):
      if j >= X[nv]:
        dp[i+1][j] = min(dp[i+1][j], dp[i][j-X[nv]]+dfs(color, nv))
      if j >= dfs(color^1, nv):
        dp[i+1][j] = min(dp[i+1][j], dp[i][j-dfs(color^1, nv)]+X[nv])
  res = min(dp[l])
  D[color][v] = res
  return res
ans = dfs(0, 0)
if ans == float("inf"):
  print("IMPOSSIBLE")
else:
  print("POSSIBLE")