Card game

# -*- coding: utf-8 -*-
"""
Created on Sat Sep 22 15:33:25 2018

@author: kiyakf1
"""

def functionCards(n,cards):
    if len(cards)<3:
        return 0
    elif len(cards)==3:
        return cards[1]
    elif len(cards)==4:
        return max(cards[1],cards[2])
    elif len(cards)==5:
        return max(cards[1],cards[2],cards[3])
    
    #start with 5
    pi = max(cards[1],cards[2],cards[3])
    pii = max(cards[1],cards[2])
    piii = cards[1]
    
    for x in xrange(5, len(cards)):
        t = max(cards[x-1]+piii,pi)
        piii=pii
        pii=pi
        pi=t
    return pi

n = raw_input()

cards = map(int,raw_input().split(" "))

print functionCards(n,cards)

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: UNKNOWN

Test 15

Verdict: UNKNOWN