Buggy python submission (verdict: Runtime Error):
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

elif abs(da[0] - da[1]) < l:
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= l:
  print("Unfair")

Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")

Buggy python submission (verdict: Runtime Error):
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
 
def aaa(d,a,t):
  k = [0]*3
  k[0] = d + a
  k[1] = d + t
  k[2] = a + t
  return k
 
for i in range(da[3]):
  if da[0] == da[1] and da[1] == da[2]:
    break
  da = aaa(da[0],da[1],da[2])
  if abs(da[0] -da[1]) >= l:
    break
  elif abs(2(da[0] -da[1])) < l or m == 1:
    m = 1
    break
 
if abs(da[0] - da[1]) < l:
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= l:
  print("Unfair")


Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")

Buggy python submission (verdict: Runtime Error):
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
 
def aaa(d,a,t):
  k = [0]*3
  k[0] = d + a
  k[1] = d + t
  k[2] = a + t
  return k
 
for i in range(da[3]):
  if da[0] == da[1] and da[1] == da[2]:
    break
  da = aaa(da[0],da[1],da[2])
  if abs(da[0] -da[1]) >= l:
    break
  elif abs(2(da[0] -da[1])) < l or m == 1:
    m = 1
    break
 
if abs(da[0] - da[1]) < pow(10,18):
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= pow(10,18):
  print("Unfair")

Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")

Buggy python submission (verdict: Runtime Error):
import sys
da = list(map(int,input().split()))

m = 0

if pow(2,da[3])*(da[0]-da[1]) >= pow(10,18):
  print("Unfair")
  sys.exit()

def aaa(d,a,t):
  k = [0]*3
  k[0] = d + a
  k[1] = d + t
  k[2] = a + t
  return k

for i in range(da[3]):
  if da[0] == da[1] and da[1] == da[2]:
    break
  da = aaa(da[0],da[1],da[2])
  if abs(da[0] -da[1]) >= pow(10,18):
    break
  if abs(2(da[0] -da[1])) < pow(10,18):
    m = 1
    break

if abs(da[0] - da[1]) < pow(10,18):
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= pow(10,18) or m ==1:
  print("Unfair")

Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")

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

m = 0

def aaa(d,a,t):
  k = [0]*3
  k[0] = d + a
  k[1] = d + t
  k[2] = a + t
  return k

for i in range(da[3]):
  if da[0] == da[1] and da[1] == da[2]:
    break
  da = aaa(da[0],da[1],da[2])
  if abs(da[0] -da[1]) >= pow(10,18):
    break
  if abs(2(da[0] -da[1])) < pow(10,18):
    m = 1
    break

if abs(da[0] - da[1]) < pow(10,18):
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= pow(10,18) or m ==1:
  print("Unfair")

Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")

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

m = 0

def aaa(d,a,t):
  k = [0]*3
  k[0] = d + a
  k[1] = d + t
  k[2] = a + t
  return k


for i in range(da[3]):
  if da[0] == da[1] and da[1] == da[2]:
    break
  da = aaa(da[0],da[1],da[2])
  if abs(da[0] -da[1]) >= pow(10,18):
    break
  if abs(2(da[0] -da[1])) < pow(10,18):
    m = 1
    break

if abs(da[0] - da[1]) < pow(10,18):
  print(da[0] - da[1])
elif abs(da[0] - da[1]) >= pow(10,18) or m ==1:
  print("Unfair")

Fixed submission:
da = list(map(int,input().split()))
 
m = 0
l = pow(10,18)
  
if da[3] % 2 == 1:
  k = da[1] -da[0]
else:
  k = da[0] -da[1]

if abs(da[0] - da[1]) <= l:
  print(k)
elif abs(da[0] - da[1]) > l:
  print("Unfair")