Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted({k:v for bar_length_count.items() if v >= 2}.items(), key=lambda x: x[0], reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])
        

Fixed submission:
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted({k:v for k, v in bar_length_count.items() if v >= 2}.items(), key=lambda x: x[0], reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted({k:v for bar_length_count.items() if v >= 2}, reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])
        

Fixed submission:
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted({k:v for k, v in bar_length_count.items() if v >= 2}.items(), key=lambda x: x[0], reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted([(k, v) for bar_length_count.items() if v >= 2], reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])
        

Fixed submission:
N = int(input())
A = list(map(int, input().split()))

bar_length_count = dict()
for a in A:
    bar_length_count[a] = bar_length_count.get(a, 0) + 1

for val in bar_length_count.values():
    pass

count_at_least_2 = 0
for val in bar_length_count.values():
    if val >= 2:
        if val >= 4:
            count_at_least_2 += 2
        else:
            count_at_least_2 += 1

if count_at_least_2 < 2:
    import sys
    print(0)
    sys.exit(0)

else:
    bar_length_count = sorted({k:v for k, v in bar_length_count.items() if v >= 2}.items(), key=lambda x: x[0], reverse=True)
    if bar_length_count[0][1] >= 4:
        print(bar_length_count[0][0]**2)
    else:
        print(bar_length_count[0][0]*bar_length_count[1][0])