Buggy python submission (verdict: Time Limit Exceeded):
count = 0
a = []
while(1):
    try:
        count += 1
        a.append([int(i) for i in input().split(",")])
    except EOFError:
        break
dim = int(count/2)
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    if dp_[i][j]:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))


Fixed submission:
from copy import copy
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        a.append([int(i) for i in input().split(",")])
        count += 1
    except EOFError:
        break
dim = int(count/2)+1
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j] is True:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        count += 1
        a.append([int(i) for i in input().split(",")])
    except EOFError:
        break
dim = int(count/2)
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    if dp_[i][j]:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))


Fixed submission:
from copy import copy
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        a.append([int(i) for i in input().split(",")])
        count += 1
    except EOFError:
        break
dim = int(count/2)+1
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j] is True:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        count += 1
        a.append([int(i) for i in input().split(",")])
    except EOFError:
        break
dim = int(count/2)
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j]:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))


Fixed submission:
from copy import copy
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        a.append([int(i) for i in input().split(",")])
        count += 1
    except EOFError:
        break
dim = int(count/2)+1
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j] is True:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        count += 1
        a.append([int(i) for i in input().split(",")])
    except EOFError:
        break
dim = int(count/2)
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j]:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
    return dp_[i][j]

print(dp(0,0))


Fixed submission:
from copy import copy
import sys
sys.setrecursionlimit(1000000)

count = 0
a = []
while(1):
    try:
        a.append([int(i) for i in input().split(",")])
        count += 1
    except EOFError:
        break
dim = int(count/2)+1
b = [[0 for i in range(dim+1)] for j in range(dim+1)]
for i in range(dim):
    for j in range(i+1):
        b[i-j][j] = a[i][j]
for i in range(dim-1):
    for j in range(dim-i-1):
        b[dim-1-j][i+1+j] = a[i+dim][j]

dp_ = [[True if i < dim else 0 for i in range(dim+1)] if j < dim else [0 for i in range(dim+1)] for j in range(dim+1)]

def dp(i,j):
    global dp_
    if dp_[i][j] is True:
        dp_[i][j] = b[i][j] + max(dp(i+1,j),dp(i,j+1))
        return dp_[i][j]
    else:
        return dp_[i][j]

print(dp(0,0))