Buggy python submission (verdict: Runtime Error):
import math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))
print(lcm(C,D))

C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)


Fixed submission:
import fractions as math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))


C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)

Buggy python submission (verdict: Runtime Error):
import math
import sys

sys.setrecursionlimit(10**7) 

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))

C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)


Fixed submission:
import fractions as math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))


C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)

Buggy python submission (verdict: Runtime Error):
import math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C
Cd = -(-A//C)
Du = B//D
Dd = -(-A//D)

LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))

C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)

Fixed submission:
import fractions as math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))


C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)

Buggy python submission (verdict: Runtime Error):
import math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))

C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)

Fixed submission:
import fractions as math

def lcm(x, y):
    return (x * y) // math.gcd(x, y)

A, B, C, D = (int(x) for x in input().split())

Cu = B//C       #Cの上限
Cd = -(-A//C)   #Cの下限
Du = B//D       #Dの上限
Dd = -(-A//D)   #Dの下限

#Least common multiple
LCMu = B//(lcm(C,D))
LCMd = -(-A//lcm(C,D))


C_num = Cu - Cd + 1
D_num = Du - Dd + 1
LCM_num = LCMu - LCMd + 1

C_D_num = C_num + D_num - LCM_num
A_B_num = B - A  + 1

ans = A_B_num - C_D_num
print(ans)