Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()

Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  if index >= N or index == 0:
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()

Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()

Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
    
  if N==0:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  
  l = index
  r = index
  for i in range(0,100):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()

Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  P = LI()
  P.sort()
  #print(X,N)
  #print(P)

  if N==0:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  
  l = index
  r = index
  for i in range(0,100):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()

Buggy python submission (verdict: Runtime Error):
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  P = LI()
  P.sort()
  print(X,N)
  print(P)

  if N==0:
    print(X)
    exit()
    
  index = bisect.bisect_left(P, X)
  
  l = index
  r = index
  for i in range(0,100):
    up = X + i
    down = X - i
    
    if l < 0:
      print(down)
      break
    
    if r > N:
      print(up)
      break
     
    # Left優先
    if P[l] != down:
      print(down)
      break
     
    if P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()


Fixed submission:
import sys
import bisect

def I(): return int(sys.stdin.readline().rstrip())
def LI():return list(map(int,sys.stdin.readline().rstrip().split()))
def LS():return list(sys.stdin.readline().rstrip().split())


def main():
  X,N = LI()[:]
  if N > 0:
    P = LI()
    P.sort()
  else:
    print(X)
    exit()
  
  #print(X,N)
  #print(P)
  
  index = bisect.bisect_left(P, X)
  #print("index=",index)
  if index >= N :
    print(X)
    exit()
    
  l = index
  r = index
  for i in range(0,200):
    up = X + i
    down = X - i
    
    #print("l=",l,"r=",r)
     
    # Left優先
    if l < 0 or P[l] != down:
      print(down)
      break

    if r >= N or P[r] != up:
      print(up)
      break
    
    l -= 1
    r += 1
    
if __name__ == '__main__':
	main()