Buggy python submission (verdict: Runtime Error):
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(1, N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = []
for i in range(digit):
    for j in range(M):
        if dp[N-num(A[j])] == dp[N] - 1 and N - num(A[j]) >= 0:
            ans.append(A[j])
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")

Fixed submission:
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(1, N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = []
for i in range(digit):
    for j in range(M):
        if N - num(A[j]) >= 0 and dp[N-num(A[j])] == dp[N] - 1:
            ans.append(A[j])
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")

Buggy python submission (verdict: Runtime Error):
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(1, N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = [0,] *(digit)
for i in range(digit):
    for j in range(M):
        if dp[N-num(A[j])] == dp[N] - 1:
            ans[i] = A[j]
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")

Fixed submission:
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(1, N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = []
for i in range(digit):
    for j in range(M):
        if N - num(A[j]) >= 0 and dp[N-num(A[j])] == dp[N] - 1:
            ans.append(A[j])
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")

Buggy python submission (verdict: Runtime Error):
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(A[-1], N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = [0,] *(digit)
for i in range(digit):
    for j in range(M):
        if dp[N-num(A[j])] == dp[N] - 1:
            ans[i] = A[j]
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")

Fixed submission:
import sys
readline = sys.stdin.readline
write = sys.stdout.write

def num(key):
    if key == 1:
        return 2
    elif key == 7:
        return 3
    elif key == 4:
        return 4
    elif key == 9 or key == 6:
        return 6
    elif key == 8:
        return 7
    else:
        return 5

N, M, = readline().split()
N = int(N)
M = int(M)
A = list(map(int, readline().split()))
A.sort(reverse = True)
dp = [-float('inf'),] *(N+1)
dp[0] = 0
for i in range(1, N+1):
    temp = []
    for j in range(M):
        if i - num(A[j]) >= 0:
            temp.append(dp[i-num(A[j])] + 1)
    if len(temp) > 0:
        dp[i] = max(temp)

digit = dp[N]
ans = []
for i in range(digit):
    for j in range(M):
        if N - num(A[j]) >= 0 and dp[N-num(A[j])] == dp[N] - 1:
            ans.append(A[j])
            N = N - num(A[j])
            break
for i in range(digit):
    write(str(ans[i]))
write("\n")