Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
ans=[]
ans_2=[]
ans_3=[]
ans_4=[]
for i in range(1,w-1):
    a=h*i
    res=w-i
    if res%2==0:
        b=h*(res//2)
        c=h*(res//2)
    else:
        b=h*(res//2)
        c=h*(res//2+1)
    ans.append(max(a,b,c)-min(a,b,c))
for i in range(1,h-1):
    a_2=i*w
    res_2=h-i
    if res_2%2==0:
        b_2=w*(res_2//2)
        c_2=w*(res_2//2)
    else:
        b_2=w*(res_2//2)
        c_2=w*(res_2//2+1)
    ans_2.append(max(a_2,b_2,c_2)-min(a_2,b_2,c_2))
for i in range(1,w-1):
    a_3=i*h
    res_3=w-i
    if h%2==0:
        b_3=res_3*(h//2)
        c_3=res_3*(h//2)
    else:
        b_3=res_3*(h//2)
        c_3=res_3*(h//2+1)
    ans_3.append(max(a_3,b_3,c_3)-min(a_3,b_3,c_3))
for i in range(1,h-1):
    a_4=w*i
    res_4=h-i
    if w%2==0:
        b_4=res_4*(w//2)
        c_4=res_4*(w//2)
    else:
        b_4=res_4*(w//2)
        c_4=res_4*(w//2+1)
    ans_4.append(max(a_4,b_4,c_4)-min(a_4,b_4,c_4))
if len(ans)==0:
    v=float("inf")
else:
    v=min(ans)
if len(ans_2)==0:
    x=float("inf")
else:
    x=min(ans_2)
if len(ans_3)==0:
    y=float("inf")
else:
    y=min(ans_3)
if len(ans_4)==0:
    z=float("inf")
else:
    z=min(ans_4)
if min(v,x,y,z)==inf:
    print(1)
else:
    print(min(v,x,y,z))


Fixed submission:
h,w=map(int,input().split())
import math
if h%3==0 or w%3==0:
    print(0)
    exit()
w_i=w//2
ans=[]
for i in range(1,h):
    sa=i*w
    sb=(h-i)*w_i
    sc=(h-i)*(w-w_i)
    ans.append(max(sa,sb,sc)-min(sa,sb,sc))
v=min(ans)
ans_3=[]
for l in range(1,h):
    h_half=(h-l)//2
    sa=w*l
    sb=w*h_half
    sc=w*((h-l)-h_half)
    ans_3.append(max(sa,sb,sc)-min(sa,sb,sc))
v_3=min(ans_3)
ans_i=[]
h_i=h//2
for j in range(1,w):
    sa=j*h
    sb=(w-j)*(h_i)
    sc=(w-j)*(h-h_i)
    ans_i.append(max(sa,sb,sc)-min(sa,sb,sc))
v_i=min(ans_i)
ans_2=[]
for k in range(1,w):
    w_half=(w-k)//2
    sa=h*k
    sb=h*w_half
    sc=h*((w-k)-w_half)
    ans_2.append(max(sa,sb,sc)-min(sa,sb,sc))
v_2=min(ans_2)
print(min(v,v_i,v_2,v_3))
#86 5

Buggy python submission (verdict: Runtime Error):
h,w=map(int,input().split())
ans=[]
ans_2=[]
ans_3=[]
ans_4=[]
for i in range(1,w-1):
    a=h*i
    res=w-i
    if res%2==0:
        b=h*(res//2)
        c=b*(res//2)
    else:
        b=h*(res//2)
        c=h*(res//2+1)
    ans.append(max(a,b,c)-min(a,b,c))
for i in range(1,h-1):
    a_2=i*w
    res_2=h-i
    if res_2%2==0:
        b_2=w*(res_2//2)
        c_2=w*(res_2//2)
    else:
        b_2=w*(res_2//2)
        c_2=w*(res_2//2+1)
    ans_2.append(max(a_2,b_2,c_2)-min(a_2,b_2,c_2))
for i in range(1,w-1):
    a_3=i*h
    res_3=w-i
    if h%2==0:
        b_3=res_3*(h//2)
        c_3=res_3*(h//2)
    else:
        b_3=res_3*(h//2)
        c_3=res_3*(h//2+1)
    ans_3.append(max(a_3,b_3,c_3)-min(a_3,b_3,c_3))
for i in range(1,h-1):
    a_4=w*i
    res_4=h-i
    if w%2==0:
        b_4=res_4*(w//2)
        c_4=res_4*(w//2)
    else:
        b_4=res_4*(w//2)
        c_4=res_4*(w//2+1)
    ans_4.append(max(a_4,b_4,c_4)-min(a_4,b_4,c_4))
v=min(ans)
x=min(ans_2)
y=min(ans_3)
z=min(ans_4)
print(min(v,x,y,z))

        

Fixed submission:
h,w=map(int,input().split())
import math
if h%3==0 or w%3==0:
    print(0)
    exit()
w_i=w//2
ans=[]
for i in range(1,h):
    sa=i*w
    sb=(h-i)*w_i
    sc=(h-i)*(w-w_i)
    ans.append(max(sa,sb,sc)-min(sa,sb,sc))
v=min(ans)
ans_3=[]
for l in range(1,h):
    h_half=(h-l)//2
    sa=w*l
    sb=w*h_half
    sc=w*((h-l)-h_half)
    ans_3.append(max(sa,sb,sc)-min(sa,sb,sc))
v_3=min(ans_3)
ans_i=[]
h_i=h//2
for j in range(1,w):
    sa=j*h
    sb=(w-j)*(h_i)
    sc=(w-j)*(h-h_i)
    ans_i.append(max(sa,sb,sc)-min(sa,sb,sc))
v_i=min(ans_i)
ans_2=[]
for k in range(1,w):
    w_half=(w-k)//2
    sa=h*k
    sb=h*w_half
    sc=h*((w-k)-w_half)
    ans_2.append(max(sa,sb,sc)-min(sa,sb,sc))
v_2=min(ans_2)
print(min(v,v_i,v_2,v_3))
#86 5