Buggy python submission (verdict: Runtime Error):
import sys
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

if k < a[0] and k < b[0]:
    print(0)
    sys.exit()

count = [[0 for i in range(n + 1)] for j in range(m + 1)]

answer = 0
for i in range(n+2):
    for j in range(m):
        if j != 0:
            count[i][j] = count[i][j-1] + a[j-1]
        if count[i][j] > k:
            break
        if answer < i + j and count[i][j] <= k:
            answer = i + j
    if i == n + 1:
        break
    count[i+1][0] = count[i][0] + b[i]
    if count[i+1][j] > k:
        break 

print(answer)


Fixed submission:
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

asum = [0]
bsum = [0]

for i in range(n):
    asum.append(asum[i] + a[i])
for i in range(m):
    bsum.append(bsum[i] + b[i])

best = m
answer = 0
for i in range(n+1):
    j = best
    while 1:
        if bsum[j] <= (k - asum[i]):
            best = j
            if answer < i + j:
                answer = i + j
            break
        j -= 1
        if j < 0:
            break

print(answer)

Buggy python submission (verdict: Runtime Error):
import sys
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

if k < a[0] and k < b[0]:
    print(0)
    sys.exit()

count = [[0 for i in range(n + 1)] for j in range(m + 1)]

answer = 0
for i in range(n+2):
    for j in range(m):
        if j != 0:
            count[i][j] = count[i][j-1] + a[j-1]
        if count[i][j] > k:
            break
        if answer < i + j and count[i][j] <= k:
            answer = i + j
    if i == n + 1:
        break
    count[i+1][0] = count[i][0] + b[i]
    if count[i+1][j] > k:
        break 

print(answer)


Fixed submission:
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

asum = [0]
bsum = [0]

for i in range(n):
    asum.append(asum[i] + a[i])
for i in range(m):
    bsum.append(bsum[i] + b[i])

best = m
answer = 0
for i in range(n+1):
    j = best
    while 1:
        if bsum[j] <= (k - asum[i]):
            best = j
            if answer < i + j:
                answer = i + j
            break
        j -= 1
        if j < 0:
            break

print(answer)

Buggy python submission (verdict: Runtime Error):
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

if k < a[0] and k < b[0]:
    print(0)

count = [[0 for i in range(n + 1)] for j in range(m + 1)]

answer = 0
for i in range(n+2):
    for j in range(m):
        if j != 0:
            count[i][j] = count[i][j-1] + a[j-1]
        if count[i][j] > k:
            break
        if answer < i + j and count[i][j] <= k:
            answer = i + j
    if i == n + 1:
        break
    count[i+1][0] = count[i][0] + b[i]
    if count[i+1][j] > k:
        break 

print(answer)


Fixed submission:
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

asum = [0]
bsum = [0]

for i in range(n):
    asum.append(asum[i] + a[i])
for i in range(m):
    bsum.append(bsum[i] + b[i])

best = m
answer = 0
for i in range(n+1):
    j = best
    while 1:
        if bsum[j] <= (k - asum[i]):
            best = j
            if answer < i + j:
                answer = i + j
            break
        j -= 1
        if j < 0:
            break

print(answer)

Buggy python submission (verdict: Runtime Error):
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))
#a.reverse()
#b.reverse()

if k < a[0] and k < b[0]:
    print(0)

count = [[0 for i in range(n + 1)] for j in range(m + 1)]

answer = 0
for i in range(n+2):
    for j in range(m):
        if j != 0:
            count[i][j] = count[i][j-1] + a[j-1]
        if count[i][j] > k:
        #    print(count[i][j])
            break
        if answer < i + j and count[i][j] <= k:
            #print(count[i][j],i,j)
            answer = i + j
    if i == n + 1:
        break
    count[i+1][0] = count[i][0] + b[i]
    if count[i+1][j] > k:
        break 
    #if answer < i + j and count[i][j] <= k:
        #answer = i + j
        #print(count[i][j])

print(answer)


Fixed submission:
n,m,k = list(map(int,input().split()))

a = list(map(int,input().split()))
b = list(map(int,input().split()))

asum = [0]
bsum = [0]

for i in range(n):
    asum.append(asum[i] + a[i])
for i in range(m):
    bsum.append(bsum[i] + b[i])

best = m
answer = 0
for i in range(n+1):
    j = best
    while 1:
        if bsum[j] <= (k - asum[i]):
            best = j
            if answer < i + j:
                answer = i + j
            break
        j -= 1
        if j < 0:
            break

print(answer)