Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

if a not in c:
    print(a)
    exit()

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))
if len(m)<=3:
    print(m[m.index(a)-1])

elif b==0:
    print(a)

elif a==100:
    print(m[m.index(a)+1])

elif abs(a-m[m.index(a)-1])<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

else:
    print(m[m.index(a)+1])

Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)

Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

if a not in c:
    print(a)
    exit()

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))
if len(m)=<3:
    print(m[m.index(a)-1])

elif b==0:
    print(a)

elif a==100:
    print(m[m.index(a)+1])

elif abs(a-m[m.index(a)-1])<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

else:
    print(m[m.index(a)+1])

Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)

Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

if a not in c:
    print(a)
    exit()

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))
if len(m)<3:
    print(m[m.index(a)-1])

elif b==0:
    print(a)

elif a==100:
    print(m[m.index(a)+1])

elif abs(a-m[m.index(a)-1])<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

else:
    print(m[m.index(a)+1])

Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)

Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))

if b==0:
    print(a)
elif a==100:
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

else:
    print(m[m.index(a)+1])


Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)

Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))

if b==0:
    print(a)

elif a==100:
    print(m[m.index(a)+1])

elif abs(a-m[m.index(a)-1])<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

elif abs(a-m[m.index(a)-1])==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)-1])

else:
    print(m[m.index(a)+1])


Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)

Buggy python submission (verdict: Runtime Error):
import bisect
a,b=map(int,input().split())
c=list(map(int,input().split()))

n=[i for i in range(-1,101)]

m=sorted(list(set(n)^set(c)))
bisect.insort_right(m,a)

m=sorted(list(set(m)))

if b==0:
    print(a)

elif a==100:
    print(m[m.index(a)]-1)

elif abs(a-m[m.index(a)]-1)<abs(a-m[m.index(a)+1]):
    print(m[m.index(a)+1])

elif abs(a-m[m.index(a)]-1)==abs(a-m[m.index(a)+1]):
    print(m[m.index(a)]-1)

else:
    print(m[m.index(a)]-1)


Fixed submission:
a,b=map(int,input().split())
c=list(map(int,input().split()))
ans=0
for i in range(100):
    if a-i not in c:
        ans=a-i
        break
    elif a+i not in c:
        ans=a+i
        break
print(ans)