ccf csp考试201803-1跳一跳答案（python实现）
nums_list = list(map(int,input().split()))
jump_score = 2
scores = 0
for num in nums_list:
if num == 1:
scores += 1
jump_score = 2
elif num == 2:
scores += jump_score
jump_score += 2
print(scores)