题解

n = int(input())
a_list = [int(input()) for _ in range(n)]

dp = [[0.0, 0.0] for _ in range(n)]
dp[0][0] = 100.0  

for i in range(n):
    a = a_list[i]
    if i == 0:
        dp[i][1] = (dp[i][0] / 100) * a
    else:
        dp[i][0] = max(dp[i-1][0], (dp[i-1][1] / a) * 100)
        dp[i][1] = max(dp[i-1][1], (dp[i][0] / 100) * a)

result = dp[-1][0]
print("{0:.2f}".format(result))