Harryxun/stf_run huggingface dataset:
def main():
    
    d,n = map(int, input().split())
    a_list = []
    ans = 0
    if d == 0:
        for i in range(1,100):
            a_list.append(i)
    elif d == 1:
        for i in range(100, 10000, 100):
            a_list.append(i)
    else:
        for i in range(10000, 1000000, 10000):
            a_list.append(i)

    print(a_list[n-1])
    
if __name__ == '__main__':
    main()

### FIXED CODE ###

d,n = map(int,input().split())
li = []
for i in range(1,102):
    if i != 100:
        li.append(i*100**d)
print(li[n-1])
3
99 1 191
100 1 192
99 0 192

### FIXED CODE ###

n=int(input())
x,y,h=[],[],[]
for _ in [0]*n:
    xi,yi,hi=[int(x) for x in input().split()]
    x.append(xi)
    y.append(yi)
    h.append(hi)
diff = 0
if min(h)>=10:
    diff=min(h)-5
h=[i-diff for i in h]
# print(h)
def pattern(cx,cy,H):
    for i in range(n):
        # print(cx,x[i],cy,y[i],H,h[i],max(H-abs(x[i]-cx)-abs(y[i]-cy),0))
        if max(H-abs(x[i]-cx)-abs(y[i]-cy),0)!=h[i]:
            return False
    return True
from itertools import product
for H in range(1,1000):
    for cx,cy, in product(range(101),range(101)):
        if pattern(cx,cy,H):
            print(cx,cy,H+diff)
            import sys
            sys.exit()
n, b=list(map(int,input().split()))

res=[]

import math

x=int(min(n-b+1,b))

for i in range(1,x+1):
	y=math.factorial(n-b+1)/math.factorial(n-b+1-i)/math.factorial(i)
	z=math.factorial(b-1)/math.factorial(b-i)/math.factorial(i-1)
	res=int(y*z%(1000000000+7))
	print(res)

### FIXED CODE ###

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

import math

#x=int(min(n-b+1,b))

#if n==b:
#  print('1')
#  for i in range(b-1):
#    print('0')
#else:
#for i in range(1,x+1):
for i in range(1,b+1):
	if i-1 > n-b:
	# 境界を i-1 個作らなければならないが、赤いボールの数 n-k よりもこれが多いと条件を満たす置き方は存在しない
		print(0)
 	#if n-b+1<i or b-1<i-1:
		#break
	else:
		y=math.factorial(n-b+1)//(math.factorial(n-b+1-i)*math.factorial(i))
		z=math.factorial(b-1)//(math.factorial(b-i)*math.factorial(i-1))
		res=int(y*z%(1000000000+7))
		print(res)


#from math import factorial
 
#N, K= map(int, input().split())
 
#def ncr(n, r):
#    return factorial(n) // (factorial(r) * factorial(n - r)) 
 
#for i in range(1, K+1):
#    if i <= N-K+1:
#        print(ncr(K-1, i-1) * ncr(N-K+1, i) % (10**9 + 7))
#    else:
#        print(0)
N = int(input())
sum = int(N % 10) + (int(N/10))
if sum % 9 == 0:
    print("Yes")
else:
    print("No")

### FIXED CODE ###

N = int(input())
x = N //1000
x1 = (N - x*1000)//100
x2 = (N - x*1000 - x1*100)//10
x3 = N - x*1000 - x1*100 - x2*10
sum = x+x1+x2+x3
if sum % 9 != 0:
    print("No")
else:
    print("Yes")
a,b=map(int,input().split())
print(a b)

### FIXED CODE ###

a,b=map(int,input().split())
print(a*b,2*(a+b))
#c
n,m,k = map(int,input().split())

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

b = list(map(int,input().split()))

c = [0]
d = 0
for i in range(n):
    d += a[i]
    c.append(d)

e = [0]
f = 0
for i in range(m):
    f += b[i]
    e.append(f)


ans = 0
j = q-1
for i in range(n):
    if c[i] > k:
        break
    else:
        while c[i] + e[j] > k:
            j -= 1
    ans = max(i + j,ans)

print(ans)

### FIXED CODE ###

n,m,k = map(int,input().split())

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

b = list(map(int,input().split()))


c = [0]
d = 0
for i in range(n):
    d += a[i]
    c.append(d)

e = [0]
f = 0
for i in range(m):
    f += b[i]
    e.append(f)


ans = 0
j = m
for i in range(n+1):
    if c[i] > k:
        break
    else:
        while c[i] + e[j] > k:
            j -= 1
    ans = max(i + j,ans)

print(ans)
n = input()
ls = list(map(int, input().split()))
count = 0
for i in range(0, n - 2):
  for j in range(i + 1, n - 1):
    two_sides_sum = i + j
    for k in range(j + 1, n):
      if two_sides_sum <= ls[k]:
        count += k - j - 1
        break
print(count)

### FIXED CODE ###

import bisect
n = int(input())

li = list(map(int, input().split()))
li.sort()

count = 0

for i in range(n - 2):
  for j in range(i + 1, n - 1):
    bi = bisect.bisect_left(li, li[i] + li[j])
    count += bi - j - 1
print(count)
from collections import defaultdict
N,M = map(int,input().split())
A = list(map(int,input().split()))
A.sort()
cost = [0,2,5,5,4,5,6,3,7,6]
dp = ['']*(N+1)
for a in A:
    dp[cost[a]] = str(a)
for i in range(N+1):
    for a in A:
        if dp[i-cost[a]] != '':
            if len(dp[i]) <= len(dp[i-cost[a]]+str(a)):
                dp[i] = dp[i-cost[a]]+str(a)
        ans = dp[N]
ans = list(map(int,list(ans)))
ans.sort(reverse=True)
print(''.join(list(map(str,ans))))

### FIXED CODE ###

d = {1:2,2:5,3:5,4:4,5:5,6:6,7:3,8:7,9:6}
N,M = map(int,input().split())
A = list(map(int,input().split()))
A.sort()
d_ = {}
for i in range(M):
    d_[d[A[i]]] = A[i]
diff = [(d_[key],key) for key in d_]
diff.sort()

DP = ['']*(10**4+1)
for a,l in diff:
    DP[l] = str(a)
    
for i in range(N+1):
    for a,l in diff:
        if i-l >= 0:
            if len(DP[i-l])+1>=len(DP[i]) and DP[i-l]!='':
                    DP[i] = str(a)+DP[i-l]

ans = list(DP[N])
ans.sort()
ans.reverse()
ans = ''.join(ans)
print(ans)
H,W,M = map(int,input().split())
h = [0]*M
w = [0]*M

from collections import defaultdict
counter_h = defaultdict(int)
counter_w = defaultdict(int)

for i in range(M):
    h[i],w[i] = map(int, input().split())
    counter_h[h[i]] += 1
    counter_w[w[i]] += 1
    
MAX_h = max(counter_h.values())
h_list = [k for k, v in counter_h.items() if v == MAX_h]
MAX_w = max(counter_w.values())
w_list = [k for k, v in counter_w.items() if v == MAX_w]

import itertools
X = list(itertools.product(h_list, w_list))

ans = MAX_h+MAX_w
check = 0

if lenX<3*10**5:
    for i in range(M):
        if (h[i],w[i]) in X:
            check += 1

if len(X)==check:
    ans -= 1
    
print(ans)

### FIXED CODE ###

H,W,M = map(int,input().split())
h = [0]*M
w = [0]*M

from collections import defaultdict
counter_h = defaultdict(int)
counter_w = defaultdict(int)

for i in range(M):
    h[i],w[i] = map(int, input().split())
    counter_h[h[i]] += 1
    counter_w[w[i]] += 1

MAX_h = max(counter_h.values())
h_list = [k for k, v in counter_h.items() if v == MAX_h]
MAX_w = max(counter_w.values())
w_list = [k for k, v in counter_w.items() if v == MAX_w]


ans = MAX_h+MAX_w
check = 0

for i in range(M):
    if counter_h[h[i]]==MAX_h and counter_w[w[i]]==MAX_w:
        check += 1

if len(h_list)*len(w_list)==check:
    ans -= 1

print(ans)
import sys
# input = sys.stdin.readline
inf = 10 ** 18

N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

ans = inf
for i in range(N - 1):
    xi, yi = xy[i]
    for j in range(i + 1, N):
        xj, yj = xy[j]
        #
        p = xj - xi
        q = yj - yi
        terms = set([])
        for n, (xn, yn) in enumerate(xy):
            mp = q * xn -  p * yn
            mod = xn % p if p > 0 else yn % q
            terms.add((mp, mod))
        # print("#", p, q, terms)
        ans_tmp = len(terms)
        #
        if ans > ans_tmp: ans = ans_tmp

print(ans)


### FIXED CODE ###

import sys
# input = sys.stdin.readline
inf = 10 ** 18

N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

x = [xi for xi, yi in xy]
y = [yi for xi, yi in xy]

ans = inf
for i in range(N - 1):
    xi, yi = xy[i]
    for j in range(i + 1, N):
        xj, yj = xy[j]
        #
        p = xj - xi
        q = yj - yi
        #
        ans_tmp = 0
        for n, (xn, yn) in enumerate(xy):
            xm = xn - p
            ym = yn - q
            # print("##", (xm, ym))
            if [xm, ym] not in xy: ans_tmp += 1
        #
        # print("#", xy, ans_tmp)
        if ans > ans_tmp: ans = ans_tmp

if N == 1:
    print(1)
else:
    print(ans)
N,L=map(int ,input().split())
print((2*L+N)*(N-1)/2 )

### FIXED CODE ###

N,L=map(int ,input().split())
if L >= 0:
    print(int((2*L+N)*(N-1)/2) )
elif L < 0 and L+N-1>=0:
    print(int((2*L+N-1)*(N)/2) )
else:
    print(int((2*L+N-2)*(N-1)/2) )
import math as mt
import numpy as np

string = input()
use = string.split('x')
word =''
for x in use:
    word += x
i = 0
n = len(word) - 1
while i < n:
    if word[i] != word[n]:
        print(-1)
        exit()
    i += 1
    n -= 1

if len(word) % 2 == 0:
    fh = []
    i = 0
    mid = int(len(word)/2)
    count = 0
    n = len(string) - 1
    for x in string:
        if x == word[i]:
            i += 1
            fh.append(count)
            count = 0
            if i == mid:
                break
        else:
            count += 1
    i = len(word) - 1
    lh = []
    count = 0
    while i != mid - 1:
        if string[n] == word[i]:
            i -= 1
            lh.append(count)
            count = 0
        else:
            count += 1
        n -= 1
    print(np.sum(np.abs(np.array(fh)-np.array(lh))))

else:
    fh = []
    i = 0
    mid = int((len(word) - 1)/2)
    count = 0
    n = len(string) - 1
    for x in string:
        if x == word[i]:
            i += 1
            fh.append(count)
            count = 0
            if i > mid:
                break
        else:
            count += 1
    i = len(word) - 1
    lh = []
    count = 0
    while i != mid - 1:
        if string[n] == word[i]:
            i -= 1
            lh.append(count)
            count = 0
        else:
            count += 1
        n -= 1
    print(np.sum(np.abs(np.array(fh)-np.array(lh))))


### FIXED CODE ###

import math as mt
import numpy as np

string = input()
collect = []
word = ''
count = 0
n = len(string)
i = 0
for x in string:
    if x != 'x':
        word += x
        collect.append(count)
        if i == n-1:
            collect.append(0)
        count = 0
    elif i == n-1:
        count += 1
        collect.append(count)
    else:
        count += 1
    i += 1

nl = len(word) - 1
i = 0
while i < nl:
    if word[i] != word[nl]:
        print(-1)
        exit()
    i += 1
    nl -=  1
nl = len(collect) - 1
i = 0
out = 0
while i < nl:
    out += np.abs(collect[i] - collect[nl])
    i += 1
    nl -= 1
print(out)
x ** 3

### FIXED CODE ###

x = input()
print(int(x) ** 3)
A,B,C = map(int,input().split())
print(min(B//A,C)

### FIXED CODE ###

A,B,C = map(int,input().split())
print(min(B//A,C))
n,m=map(int,input().split())
keep=0
aa=["#"]*n
for i in range(m):
  s,c=map(str,input().split())
  s=int(s)
  if n>=2 and s==1 and c=="0":
    keep=1
    print(-1)
    break
  if aa[s-1]=="#":
    aa[s-1]=c
  elif aa[s-1] !=c:
    keep=1
    print(-1)
    break
if keep==0:
  moji=""
  if aa[0]=="#" and n>=2:
    moji+="1"
  elif n==1 and aa[0]=="#":
    moji+="0"
  else:
    moji+=aa[0]
  for i in range(1,n):
    if aa[i]=="#":
      moji+="0"
    else:
      moji+=aa[i]
  print(moji)

### FIXED CODE ###

s=int(input())
if s%2==0:
  print(s//2)
else:
  print(s//2+1)
def main():
    nvertices, nedges = map(int, input().split())
    Adj = [[] for i in range(nvertices)]
    AdjRev = [[] for i in range(nvertices)]
    for i in range(nedges):
        u, v = map(int, input().split())
        Adj[u].append(v)
        AdjRev[v].append(u)

    lst = []
    visited = [False] * nvertices
    for u in range(nvertices):
        if not visited[u]:
            dfs_first(u, Adj, visited, lst)

    lst.reverse()
    ids = [-1] * nvertices
    visited = [False] * nvertices
    id = 0
    for u in lst:
        if not visited[u]:
            dfs_second(u, AdjRev, visited, id, ids)
            id += 1

    Q = int(input())
    for i in range(Q):
        u, v = map(int, input().split())
        print(1 if ids[u] == ids[v] else 0)


def dfs_first(u, Adj, visited, lst):
    visited[u] = True
    for v in Adj[u]:
        if not visited[v]:
            dfs_first(v, Adj, visited, lst)
    lst.append(u)


def dfs_second(u, Adj, visited, id, ids):
    ids[u] = id
    visited[u] = True
    for v in Adj[u]:
        if not visited[v]:
            dfs_second(v, Adj, visited, id, ids)

main()

### FIXED CODE ###

import sys

def main():
    sys.setrecursionlimit(int(1e5))
    nvertices, nedges = map(int, input().split())
    Adj = [[] for i in range(nvertices)]
    AdjRev = [[] for i in range(nvertices)]
    for i in range(nedges):
        u, v = map(int, input().split())
        Adj[u].append(v)
        AdjRev[v].append(u)

    lst = []
    visited = [False] * nvertices
    for u in range(nvertices):
        if not visited[u]:
            dfs_first(u, Adj, visited, lst)

    lst.reverse()
    ids = [-1] * nvertices
    visited = [False] * nvertices
    id = 0
    for u in lst:
        if not visited[u]:
            dfs_second(u, AdjRev, visited, id, ids)
            id += 1

    Q = int(input())
    for i in range(Q):
        u, v = map(int, input().split())
        print(1 if ids[u] == ids[v] else 0)


def dfs_first(u, Adj, visited, lst):
    visited[u] = True
    for v in Adj[u]:
        if not visited[v]:
            dfs_first(v, Adj, visited, lst)
    lst.append(u)


def dfs_second(u, Adj, visited, id, ids):
    ids[u] = id
    visited[u] = True
    for v in Adj[u]:
        if not visited[v]:
            dfs_second(v, Adj, visited, id, ids)

main()
L, R = map(int, input().split())
small1 = L % 2019
small2 = R % 2019
for i in range(L, R+1):
    ans = i % 2019
    if  ans < small1:
        small2 = small1
        small1 = ans
    elif ans < small2:
        small2 = ans
    if small1 == 0:
        break
print(small1 * small2)

### FIXED CODE ###

N, A, B = map(int, input().split())
print(min(N*A, B))
import math
a,b,c,d=list(map(int,input().split()))
a-=1
calc_c=(b-b//c)-(a-a//c)
calc_d=(b-b//d)-(a-a//d)
count=calc_c+calc_d
def lcm(x, y):
    #return (x * y) // math.gcd(x, y)
    return math.floor((x * y) /math.gcd(x, y))


com=lcm(c, d)
tmp=(b-b//com)-(a-a//com)
print(count-tmp)

### FIXED CODE ###

import math
import fractions
a,b,c,d=list(map(int,input().split()))
a-=1
calc_c=(b-b//c)-(a-a//c)
calc_d=(b-b//d)-(a-a//d)
count=calc_c+calc_d
def lcm(x, y):
    #return (x * y) // math.gcd(x, y)
    return math.floor((x * y) /fractions.gcd(x, y))


com=lcm(c, d)
tmp=(b-b//com)-(a-a//com)
print(count-tmp)
import numpy as np
from collections import deque
class Graph:
    edges = {}

    def append_edge(self, sv, ev, weight = 1):
        if sv in self.edges:
            self.edges[sv].append((ev, weight))
        else:
            self.edges[sv] = [(ev, weight)]

    def bfs(self, sv):
        dist = np.full(len(self.edges.keys()), -1)
        q = deque([])   # キュー
        q.append(sv)
        dist[sv] = 0
        connect_vtxs = []
        while len(q) > 0:
            p = q.popleft()     # キュー取りだし（先頭）
            connect_vtxs.append(p)
            for (ev, w) in self.edges[p]:
                if dist[ev] != -1:
                    continue
                q.append(ev)    # キュー追加
                dist[ev] = dist[p] + 1
        return dist, connect_vtxs


N, X, Y = list(map(int, input().split()))

g = Graph()
for i in range(N - 1):
    g.append_edge(i, i + 1)
    g.append_edge(i + 1, i)
g.append_edge(X - 1, Y - 1)
g.append_edge(Y - 1, X - 1)

dist_cnt = np.zeros(N)
for sv in range(N):
    dist, connect_vtxs = g.bfs(sv)
    for j in range(dist.shape[0]):
        if dist[j] == -1: continue
        dist_cnt[dist[j]] += 1

for i in range(N-1):
    print(int(dist_cnt[i+1]/2))


### FIXED CODE ###

K, N = list(map(int, input().split()))
A = list(map(int, input().split()))
A.append(K+A[0])
diff_list = []
for i in range(len(A) - 1):
    diff_list.append(A[i+1]-A[i])
print(K - max(diff_list))
s = int(input())
s_list = []
if s != 1 or s != 2:
    while s != 1:
        if s % 2 == 0:
            s = s / 2
        else:
            s = 3 * s + 1
        s_list.append(s)
    print(max(len(s_list)+2), 4)
else:
    print(4)

### FIXED CODE ###

s = int(input())
s_list = []
if s != 1 or s != 2:
    while s != 1:
        if s % 2 == 0:
            s = s / 2
        else:
            s = 3 * s + 1
        s_list.append(s)
    print(max(len(s_list)+2, 4))
else:
    print(4)
# -*- coding: utf-8 -*-
NQ = input().split(" ")
S = str(input())
N = int(NQ[0])
Q = int(NQ[1])
result_list = []
l = 0
r = 0
lr = ""
for i in range(0, Q):
  lr = input().split(" ")
  l = int(lr[0])
  r = int(lr[1])
  subStr_S = str(S[l-1:r]).replace("G", "").replace("T", "")
  result_list.append(subStr_S.count("AC"))

[print(result) for result in result_list]

### FIXED CODE ###

# -*- coding: utf-8 -*-
input_val = str(input())

if input_val == "A":
  print("T")
elif input_val == "T":
  print("A")
elif input_val == "G":
  print("C")
elif input_val == "C":
  print("G")
N = int(input())
import math
def s(n):
  if n == 1:
    return 1
  else:
    return (n*s(n-1))%(10**9+7)
print(s(N))

### FIXED CODE ###

N = int(input())
x = 1
i = 1
while i <= N:
  x = (x*i)%(10**9+7)
  i += 1
print(x)
import sys

def cal(x):
	point = 0
	for index2 in ans_list:
		if x==ans_list[index2]:
			point +=1
	score=K+point-Q
	return score	

num1 = list(map(int, input().split()))
N = num1[0] #参加者数
K = num1[1] #初期ポイント
Q = num1[2] #出た正解の数
ans_list = []
for index1 in range(Q):
	ans_list.append(int(input()))
for index1 in range(N):
	fin = cal(index1)
	if fin <=0:
		print("No")
	else:
		print("Yes")

### FIXED CODE ###

N, K, Q = map(int,input().split())
point_list = [0 for i in range(N+1)]
for i in range(Q):
    A = int(input())
    point_list[A]+=1
for i in range(1,N+1):
    if point_list[i]+K-Q<=0:
        print("No")
    else:
        print("Yes")
n = input()

answers = map(int, raw_input().split()).sort()

for answer in answers:
  print answer,

### FIXED CODE ###

n = input()

answers = sorted(map(int, raw_input().split()))

for answer in answers:
  print answer,
n, m = map(int,input().split())
li = []
for _ in range(m):
    li.append(list(map(int,input().split())))
li = list(map(list, set(map(tuple, li))))
li = sorted(li)
number = 0
for i in range(len(li)-1):
    if li[i][0] == li[i+1][0]:
        print(-1)
        exit()
    else:
        number += li[i][1] * (10 ** (n-li[i][0])    )
number += li[len(li)-1][1] * (10 ** (n-li[len(li)-1][0])    )
if li[0][0] == 1 and li[0][1] == 0 and n >= 2:
    print(-1)
    exit()
print(number)

### FIXED CODE ###

from sys import stdin
import math

n, m = [int(x) for x in stdin.readline().rstrip().split()]

s = [0] * m
c = [0] * m
for i in range(m):
    s[i], c[i] = [int(x) for x in stdin.readline().rstrip().split()]

result = -1
for nn in range(10 ** n):
    ns = str(nn)
    if len(ns) < n:
        continue
    #ns = ns.zfill(n)
    flag = True
    for i in range(m):
        if ns[s[i]-1] == str(c[i]):
            continue
        else:
            flag = False
            break
    if flag:
        result = nn
        if n > 1 and result == 0:
            result = -1
        break

print(result)
import sys
readline=sys.stdin.buffer.redline
n=int(input())
a=[list(map(int, readline().split())) for _ in range(n)]
a.sort(key=lambda x: x[1])
t=0
for i in range(n):
  t+=a[i][0]
  if t>a[i][1]:
    print("No")
    break
  elif i==n-1:
    print("Yes")


### FIXED CODE ###

n=int(input())
a=[list(map(int,input().split())) for _ in range(n)]
a.sort(key=lambda x: x[1])
t=0
for i in range(n):
  t+=a[i][0]
  if t>a[i][1]:
    print("No")
    break
  elif i==n-1:
    print("Yes")
n, q = map(int, input().split())
s = input()
for i in range(q):
  l, r = map(int, input().split())
  substring = s[1 - 1 : r]
  print(substring)
  sp = substring.replace('AC', '+')
  print(sp)
  print(sp.count("+"))

  

### FIXED CODE ###

n, q = map(int, input().split())
S = input()

Sev = [0] * n
for i in range(n-1):
  if S[i] == "A" and S[i+1] == "C":
    Sev[i] = 1

Simos = [0] * n
Simos[0] = Sev[0]
for i in range(1, n):
  Simos[i] = Simos[i-1] + Sev[i]
    
for i in range(q):
  l, r = map(int, input().split())
  l = l-1
  r = r-1
  r = r-1
  if l == 0:
    print(Simos[r])
  else:
    print(Simos[r] - Simos[l-1])
# original submission: https://atcoder.jp/contests/tokiomarine2020/submissions/14259812
import math
N, K = map(int, input().split())
A = list(map(int, input().split()))

if K > 4 * math.log2(N):
    for _ in range(N):
        print(N," ", end = "")
    print()
else:
    for i in range(K):
    	cum_sum = [0]*N
        for j in range(N):
            left = j - A[j]
            right = j + A[j]
            cum_sum[left if left >= 0 else 0] += 1
            if right + 1 < N:
                cum_sum[right+1] -= 1
        A[0] = cum_sum[0]
        changed = False
        for j in range(N-1):
            cum_sum[j+1] += cum_sum[j]
            if A[j+1] != cum_sum[j+1]:
            	changed = True
            	A[j+1] = cum_sum[j+1]
        if not changed:
          break
    for i in range(N):
        print(A[i], " ", end = "")
    print()
            


### FIXED CODE ###

# original submission: https://atcoder.jp/contests/tokiomarine2020/submissions/14259812
import math
N, K = map(int, input().split())
A = list(map(int, input().split()))

if K > 4 * math.log2(N):
    for _ in range(N):
        print(N," ", end = "")
    print()
else:
    for i in range(K):
        cum_sum = [0]*N
        for j in range(N):
            left = max(0, j - A[j])
            right = min(N-1, j+A[j])
            cum_sum[left] += 1
            if right + 1 < N:
                cum_sum[right+1] -= 1
        A[0] = cum_sum[0]
        for j in range(N-1):
            cum_sum[j+1] += cum_sum[j]
            A[j+1] = cum_sum[j+1]

            
    for i in range(N):
        print(A[i], " ", end = "")
    print()
N=int(input())
a=[]
for i in range(N):
  a.append(input())
print(len(collections.Counter(a)))

### FIXED CODE ###

import collections
N=int(input())
a=[]
for i in range(N):
  a.append(input())
print(len(collections.Counter(a)))
n = int(input())
a = sorted([int(i) for i in input().split()])
mod = 10e9+7
if n%2==0:
    able = []
    for i in range(1,n,2):
        able.append(i)
        able.append(i)
else:
    able = [0]
    for i in range(2,n,2):
        able.append(i)
        able.append(i)

if a == able:
    r = n//2
    ans = 2**r % mod
    print(int(ans))
else:
    print(0)


### FIXED CODE ###

n = int(input())
a = sorted([int(i) for i in input().split()])
mod = 10**9+7
if n%2==0:
    able = []
    for i in range(1,n,2):
        able.append(i)
        able.append(i)
else:
    able = [0]
    for i in range(2,n,2):
        able.append(i)
        able.append(i)

if a == able:
    r = n//2
    ans = 1
    for i in range(0,r):
        ans = ans * 2 % mod
    print(int(ans))
else:
    print(0)