Buggy python submission (verdict: Runtime Error):
H, W = map(int, input().split())
if H%3 == 0 or H%3 == 0:
    ans = 0
else:
    ansl = [H] + [W] + [H*W] * 2
    if W%2 == 0:
        for i in range(1, H):
            tmp = abs(i * W - (H-i) * W // 2)
            if ansl[2] > tmp:
                ansl[2] = tmp
    else:
        for i in range(1, H):
            S1 = W * i
            S2 = (H-i) * (W//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[2] > tmp:
                ansl[2] = tmp
    if H == W:
        ansl[3] = ansl[2]
    elif H%2 == 0:
        for i in range(1, W):
            tmp = abs(i * H - (W-i) * H // 2)
            if ansl[3] > tmp:
                ansl[3] = tmp
    else:
        for i in range(1, W):
            S1 = H * i
            S2 = (W-i) * (H//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[3] > tmp:
                ansl[3] = tmp
	ans = min(ansl)
print(ans)


Fixed submission:
H, W = map(int, input().split())
if H%3 == 0 or H%3 == 0:
    ans = 0
else:
    ansl = [H] + [W] + [H*W] * 2
    if W%2 == 0:
        for i in range(1, H):
            tmp = abs(i * W - (H-i) * W // 2)
            if ansl[2] > tmp:
                ansl[2] = tmp
    else:
        for i in range(1, H):
            S1 = W * i
            S2 = (H-i) * (W//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[2] > tmp:
                ansl[2] = tmp
    if H == W:
        ansl[3] = ansl[2]
    elif H%2 == 0:
        for i in range(1, W):
            tmp = abs(i * H - (W-i) * H // 2)
            if ansl[3] > tmp:
                ansl[3] = tmp
    else:
        for i in range(1, W):
            S1 = H * i
            S2 = (W-i) * (H//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[3] > tmp:
                ansl[3] = tmp
    ans = min(ansl)
print(ans)

Buggy python submission (verdict: Runtime Error):
H, W = map(int, input().split())
if H%3 == 0 or H%3 == 0:
    ans = 0
else:
    ansl = [H] + [W] + [H*W] * 2
    if W%2 == 0:
        for i in range(1, H):
            tmp = abs(i * W - (H-i) * W // 2)
            if ansl[2] > tmp:
                ansl[2] = tmp
    else:
        for i in range(1, H):
            S1 = W * i
            S2 = (H-i) * (W//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[2] > tmp:
                ansl[2] = tmp
    if H == W:
        ansl[3] = ansl[2]
    elif H%2 == 0:
        for i in range(1, W):
            tmp = abs(i * H - (W-i) * H // 2)
            if ansl[3] > tmp:
                ansl[3] = tmp
    else:
        for i in range(1, W):
            S1 = H * i
            S2 = (W-i) * (H//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[3] > tmp:
                ansl[3] = tmp
ans = min(ansl)
print(ans)


Fixed submission:
H, W = map(int, input().split())
if H%3 == 0 or H%3 == 0:
    ans = 0
else:
    ansl = [H] + [W] + [H*W] * 2
    if W%2 == 0:
        for i in range(1, H):
            tmp = abs(i * W - (H-i) * W // 2)
            if ansl[2] > tmp:
                ansl[2] = tmp
    else:
        for i in range(1, H):
            S1 = W * i
            S2 = (H-i) * (W//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[2] > tmp:
                ansl[2] = tmp
    if H == W:
        ansl[3] = ansl[2]
    elif H%2 == 0:
        for i in range(1, W):
            tmp = abs(i * H - (W-i) * H // 2)
            if ansl[3] > tmp:
                ansl[3] = tmp
    else:
        for i in range(1, W):
            S1 = H * i
            S2 = (W-i) * (H//2)
            S3 = H*W - S1 - S2
            tmp = max(S1, S2, S3) - min(S1, S2, S3)
            if ansl[3] > tmp:
                ansl[3] = tmp
    ans = min(ansl)
print(ans)