Buggy python submission (verdict: Runtime Error):
#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2))%1000000007)
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
            print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2))%1000000007)
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
            print(a)
    else:
        print(0)

        

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        print(int(2**(n/2))%1000000007)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2))%1000000007)
    else:
        print(0)

        

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):

n=int(input())
rowdata=[int(i) for i in input().split()]
rowdata.sort()

if n%2==0:
    check=[]
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        print(int(2**(n/2)))
    else:
        print(0)
else:
    check=[]
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2)))
    else:
        print(0)

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):

n=int(input())
rowdata=[int(i) for i in input().split()]
rowdata.sort()

if n%2==0:
    check=[]
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        print(int(2**(n/2)))
    else:
        print(0)
else:
    check=[]
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2)))
    else:
        print(0)

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):
n=int(input())
rowdata=[int(i) for i in input().split()]
rowdata.sort()
print(rowdata)

#nが偶数の時
if n%2==0:
    check=[]
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        print(int(2**(n/2)))
    else:
        print(0)
else:
    check=[]
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2)))
    else:
        print(0)

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)

Buggy python submission (verdict: Runtime Error):
n=int(input())
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        print(int(2**(n/2)))
    else:
        print(0)
else:
    check=[]
    for i in range(0,n,2):
        if i==0:
            check.append(i)
        else:
            check.append(i)
            check.append(i)
    if check==rowdata:
        print(int(2**((n-1)/2)))
    else:
        print(0)

Fixed submission:
n=int(input())

#データを並び替える
rowdata=[int(i) for i in input().split()]
rowdata.sort()

#nが偶数の時
if n%2==0:
    check=[]
    a=1
    for i in range(1,n,2):
        check.append(i)
        check.append(i)
    if check==rowdata:
        for i in range(int(n/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)
        
#nが奇数の時
else:
    check=[]
    a=1
    if n==1:
        check=[0]
    else:
        for i in range(0,n,2):
            if i==0:
                check.append(i)
            else:
                check.append(i)
                check.append(i)
    if check==rowdata:
        for i in range(int((n-1)/2)):
            a*=2
            a=a%1000000007
        print(a)
    else:
        print(0)