Buggy python submission (verdict: Runtime Error):
N, A = map(int, input().split())
x= [int(i) for i in input().split()]
X = max(x)
dp = [[[0]*(X*N+1) for i in range(N+1)] for j in range(N+1)]
dp[0][0][0] = 1
ans = 0

for j in range(1,N+1):
  for k in range(j+1):
    for s in range(X*N+1):
      dp[j][k][s] = dp[j-1][k][s]
      if s >= x[j-1]:
        dp[j][k][s] += dp[j-1][k-1][s-x[j-1]]
      
for i in range(1,N+1):
  ans += dp[-1][i][i*A]
  if (i+1)*A > X*N:
    break
print(ans)

Fixed submission:
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)

Buggy python submission (verdict: Runtime Error):
N, A = map(int, input().split())
x= [int(i) for i in input().split()]
X = max(x)
dp = [[[0]*(X*N+1) for i in range(N+1)] for j in range(N+1)]
dp[0][0][0] = 1
ans = 0

for j in range(1,N+1):
  for k in range(j+1):
    for s in range(X*N+1):
      dp[j][k][s] = dp[j-1][k][s]
      if s >= x[j-1]:
        dp[j][k][s] += dp[j-1][k-1][s-x[j-1]]
      
for i in range(1,N+1):
  ans += dp[-1][i][i*A]
  if (i+1)*A >= X*N:
    break
print(ans)

Fixed submission:
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)

Buggy python submission (verdict: Runtime Error):
N, A = map(int, input().split())
x = [int(i) for i in input().split()]
ans = 0
X = max(x)
dp = [[[0]*(X*N+1) for j in range(N+1)] for k in range(N+1)]
dp[0][0][0] = 1 
for j in range(1,N+1):
  for k in range(N+1):
    for s in range(X*N+1):
      dp[j][k][s] = dp[j-1][k][s]
      if s>=x[j-1]:
        dp[j][k][s] += dp[j-1][k-1][s-x[j-1]]
for k in range(1,N+1):
  ans += dp[N][k][k*A]
print(ans)

Fixed submission:
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N, A = map(int, input().split())
x = [int(i) for i in input().split()]
ans = 0

dp = [[[0]*(50*N+1) for j in range(N+1)] for k in range(N+1)]
dp[0][0][0] = 1 
for j in range(1,N+1):
  for k in range(N+1):
    for s in range(50*N+1):
      dp[j][k][s] = dp[j-1][k][s]
      if s>=x[j-1]:
        dp[j][k][s] += dp[j-1][k-1][s-x[j-1]]
for k in range(1,N+1):
  ans += dp[N][k][k*A]
print(ans)

Fixed submission:
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)

Fixed submission:
N, A = map(int, input().split())
x = [int(i) for i in input().split()]

table = [[[0]*(N*A+1) for i in range(N+1)] for j in range(N+1)]
table[0][0][0] = 1

for j in range(1,N+1):
  for k in range(N+1):
    for s in range(N*A+1):
      c = x[j-1]
      if s-c<0:
        table[j][k][s] = table[j-1][k][s]
      elif s-c>=0 and k>=1:
        table[j][k][s] = table[j-1][k][s] + table[j-1][k-1][s-c]
      
ans = 0
for i in range(1,N+1):
  ans += table[N][i][i*A]
print(ans)