# your code goes here
x = [2,4,6,7,8]
dp = [0]* len(x)
dp[0] = 2
dp[1] = 4
for i in range(2, len(x)):
dp[i] = max(x[i], x[i]+dp[i-2])
print(dp[len(x)-1])
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCnggPSBbMiw0LDYsNyw4XQoKZHAgPSBbMF0qIGxlbih4KQpkcFswXSA9IDIKZHBbMV0gPSA0CmZvciBpIGluIHJhbmdlKDIsIGxlbih4KSk6CglkcFtpXSA9IG1heCh4W2ldLCB4W2ldK2RwW2ktMl0pCgpwcmludChkcFtsZW4oeCktMV0pIA==