Buggy python submission (verdict: Runtime Error):
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = np.array(LI())
	nx = n*max(x_list+[a])
	y_list = x_list - a
	dp = np.full((n+1,2*nx+1),None)

	def dfs(j,t):
		dp_value = dp[j,t]
		if dp_value == None:
			if j == 0 and t == nx:
				dp_value = 1
			elif j >= 1 and (y_list[j-1] < t - 2*nx or y_list[j-1] > t):
				dp_value = dfs(j-1, t)
			elif j >= 1 and 0 <= t - y_list[j-1] <= 2*nx:
				dp_value = dfs(j-1, t) + dfs(j-1, t-y_list[j-1])
			else:
				dp_value = 0
			dp[j,t] = dp_value
		return int(dp_value)

	print(dfs(n, nx) -1)


if __name__ == '__main__':
    main()

Fixed submission:
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = np.array(LI())
	nx = n*max(x_list+[a])
	y_list = x_list - a
	dp = np.full((n+1,2*nx+1),INF)

	def dfs(j,t):
		dp_value = dp[j,t]
		if dp_value == INF:
			if j == 0 and t == nx:
				dp_value = 1
			elif j >= 1 and (y_list[j-1] < t - 2*nx or y_list[j-1] > t):
				dp_value = dfs(j-1, t)
			elif j >= 1 and 0 <= t - y_list[j-1] <= 2*nx:
				dp_value = dfs(j-1, t) + dfs(j-1, t-y_list[j-1])
			else:
				dp_value = 0
			dp[j,t] = dp_value
		return int(dp_value)

	print(dfs(n, nx) -1)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = LI()
	dp = np.full((n+1,n+1,n*max(x_list+[a])+1),-1)

	def dfs(j,k,s):
		dp_value = dp[j,k,s]
		if dp_value == -1:
			if j == 0 and k == 0 and s == 0:
				dp_value = 1
			elif j >= 1 and x_list[j-1] > s:
				dp_value = dfs(j-1, k, s)
			elif j >= 1 and k >= 1 and s >= x_list[j-1]:
				dp_value = dfs(j-1, k, s) + dfs(j-1, k-1, s-x_list[j-1])
			else:
				dp_value = 0
			dp[j,k,s] = dp_value
		return dp_value

	print(int(sum([dfs(n, k, k*a) for k in range(1,n+1)])))



if __name__ == '__main__':
    main()

Fixed submission:
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = np.array(LI())
	nx = n*max(x_list+[a])
	y_list = x_list - a
	dp = np.full((n+1,2*nx+1),INF)

	def dfs(j,t):
		dp_value = dp[j,t]
		if dp_value == INF:
			if j == 0 and t == nx:
				dp_value = 1
			elif j >= 1 and (y_list[j-1] < t - 2*nx or y_list[j-1] > t):
				dp_value = dfs(j-1, t)
			elif j >= 1 and 0 <= t - y_list[j-1] <= 2*nx:
				dp_value = dfs(j-1, t) + dfs(j-1, t-y_list[j-1])
			else:
				dp_value = 0
			dp[j,t] = dp_value
		return int(dp_value)

	print(dfs(n, nx) -1)


if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = LI()
	x_list.sort()
	sum_list = deque([[i,x,1] for i, x in enumerate(x_list)])
	count = x_list.count(a)
	while sum_list:
		i, x, num = sum_list.popleft()
		for j in range(i+1,n):
			sum_tmp = x + x_list[j]
			if sum_tmp < a * (num+1):
				sum_list.append([j,sum_tmp,num+1])
			elif sum_tmp == a * (num+1):
				sum_list.append([j,sum_tmp,num+1])
				count += 1
			else:
				break
	print(count)
	







if __name__ == '__main__':
    main()

Fixed submission:
import sys
import numpy as np
import random
from decimal import Decimal
import itertools
import re
import bisect
from collections import deque, Counter
from functools import lru_cache

sys.setrecursionlimit(10**9)
INF = 10**13
def LI(): return list(map(int, sys.stdin.buffer.readline().split()))
def I(): return int(sys.stdin.buffer.readline())
def LS(): return sys.stdin.buffer.readline().rstrip().decode('utf-8').split()
def S(): return sys.stdin.buffer.readline().rstrip().decode('utf-8')
def IR(n): return [I() for i in range(n)]
def LIR(n): return [LI() for i in range(n)]
def SR(n): return [S() for i in range(n)]
def LSR(n): return [LS() for i in range(n)]
def SRL(n): return [list(S()) for i in range(n)]
def MSRL(n): return [[int(j) for j in list(S())] for i in range(n)]
def SERIES(n): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ')
def GRID(h,w): return np.fromstring(sys.stdin.buffer.read(), dtype=np.int32, sep=' ').reshape(h,-1)[:,:w]
def GRIDfromString(h,w): return np.frombuffer(sys.stdin.buffer.read(), 'S1').reshape(h,-1)[:,:w]
MOD = 1000000007

def main():
	n, a = LI()
	x_list = np.array(LI())
	nx = n*max(x_list+[a])
	y_list = x_list - a
	dp = np.full((n+1,2*nx+1),INF)

	def dfs(j,t):
		dp_value = dp[j,t]
		if dp_value == INF:
			if j == 0 and t == nx:
				dp_value = 1
			elif j >= 1 and (y_list[j-1] < t - 2*nx or y_list[j-1] > t):
				dp_value = dfs(j-1, t)
			elif j >= 1 and 0 <= t - y_list[j-1] <= 2*nx:
				dp_value = dfs(j-1, t) + dfs(j-1, t-y_list[j-1])
			else:
				dp_value = 0
			dp[j,t] = dp_value
		return int(dp_value)

	print(dfs(n, nx) -1)


if __name__ == '__main__':
    main()