Buggy python submission (verdict: Runtime Error):
#
# 　　  ⋀_⋀　 
#　　  (･ω･)  
# .／ Ｕ ∽ Ｕ＼
#  │＊　合　＊│
#  │＊　格　＊│ 
#  │＊　祈　＊│ 
#  │＊　願　＊│ 
#  │＊　　　＊│ 
#      ￣
#
import sys
sys.setrecursionlimit(10**6)
input=sys.stdin.readline
from math import floor,sqrt,factorial,hypot,log #log2ないｙｐ
from heapq import heappop, heappush, heappushpop
from collections import Counter,defaultdict,deque
from itertools import accumulate,permutations,combinations,product,combinations_with_replacement
from bisect import bisect_left,bisect_right
from copy import deepcopy,copy
from fractions import gcd
from random import randint
def ceil(a,b): return (a+b-1)//b
inf=float('inf')
mod = 10**9+7
def pprint(*A): 
    for a in A:     print(*a,sep='\n')
def INT_(n): return int(n)-1
def MI(): return map(int,input().split())
def MF(): return map(float, input().split())
def MI_(): return map(INT_,input().split())
def LI(): return list(MI())
def LI_(): return [int(x) - 1 for x in input().split()]
def LF(): return list(MF())
def LIN(n:int): return [I() for _ in range(n)]
def LLIN(n: int): return [LI() for _ in range(n)]
def LLIN_(n: int): return [LI_() for _ in range(n)]
def LLI(): return [list(map(int, l.split() )) for l in input()]
def I(): return int(input())
def F(): return float(input())
def ST(): return input().replace('\n', '')
def main():
    N=I()
    candidate = set("3","5","7")
    for i in range(9):
        for c in copy(candidate):
            candidate.add(c+"3")
            candidate.add(c+"5")
            candidate.add(c+"7")
    
    ans = 0
    for c in candidate:
        if int(c)<=N and 0 not in (c.count("3"),c.count("5"),c.count("7")):
            ans += 1
    print(ans)



if __name__ == '__main__':
    main()



Fixed submission:
N = int(input())
digit = len(str(N))
list753 = ["3", "5", "7"]  # string

for i in range(digit):
    for n in list753:
        if len(n) == i:
            list753.append(n + "7")
            list753.append(n + "5")
            list753.append(n + "3")

# print(list753)
counter = 0
for num in list753:
    if int(num) <= N and 0 not in [num.count("3"), num.count("5"), num.count("7")]:
        counter += 1
print(counter)

Buggy python submission (verdict: Runtime Error):
#
# 　　  ⋀_⋀　 
#　　  (･ω･)  
# .／ Ｕ ∽ Ｕ＼
#  │＊　合　＊│
#  │＊　格　＊│ 
#  │＊　祈　＊│ 
#  │＊　願　＊│ 
#  │＊　　　＊│ 
#      ￣
#
import sys
sys.setrecursionlimit(10**6)
input=sys.stdin.readline
from math import floor,sqrt,factorial,hypot,log #log2ないｙｐ
from heapq import heappop, heappush, heappushpop
from collections import Counter,defaultdict,deque
from itertools import accumulate,permutations,combinations,product,combinations_with_replacement
from bisect import bisect_left,bisect_right
from copy import deepcopy
from fractions import gcd
from random import randint
def ceil(a,b): return (a+b-1)//b
inf=float('inf')
mod = 10**9+7
def pprint(*A): 
    for a in A:     print(*a,sep='\n')
def INT_(n): return int(n)-1
def MI(): return map(int,input().split())
def MF(): return map(float, input().split())
def MI_(): return map(INT_,input().split())
def LI(): return list(MI())
def LI_(): return [int(x) - 1 for x in input().split()]
def LF(): return list(MF())
def LIN(n:int): return [I() for _ in range(n)]
def LLIN(n: int): return [LI() for _ in range(n)]
def LLIN_(n: int): return [LI_() for _ in range(n)]
def LLI(): return [list(map(int, l.split() )) for l in input()]
def I(): return int(input())
def F(): return float(input())
def ST(): return input().replace('\n', '')
def main():
    N=I()
    candidate = ["3","5","7"]
    for i in range(9):
        for c in candidate.copy():
            candidate.append(c+"3")
            candidate.append(c+"5")
            candidate.append(c+"7")
    
    ans = 0
    for c in candidate:
        if int(c)<=N and 0 not in (c.count("3"),c.count("5"),c.count("7")):
            ans += 1
    print(ans)



if __name__ == '__main__':
    main()

Fixed submission:
N = int(input())
digit = len(str(N))
list753 = ["3", "5", "7"]  # string

for i in range(digit):
    for n in list753:
        if len(n) == i:
            list753.append(n + "7")
            list753.append(n + "5")
            list753.append(n + "3")

# print(list753)
counter = 0
for num in list753:
    if int(num) <= N and 0 not in [num.count("3"), num.count("5"), num.count("7")]:
        counter += 1
print(counter)

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
counter = 0
for i in range(357, N + 1):
    string = str(i)
    count3 = string.count("3")
    count5 = string.count("5")
    count7 = string.count("7")
    #print(i, count3, count5, count7)
    if count3 + count5 + count7 == len(string) and 0 not in [count3, count5, count7]:
        counter += 1

print(counter)



Fixed submission:
N = int(input())
digit = len(str(N))
list753 = ["3", "5", "7"]  # string

for i in range(digit):
    for n in list753:
        if len(n) == i:
            list753.append(n + "7")
            list753.append(n + "5")
            list753.append(n + "3")

# print(list753)
counter = 0
for num in list753:
    if int(num) <= N and 0 not in [num.count("3"), num.count("5"), num.count("7")]:
        counter += 1
print(counter)