"""
[25756: 방어율 무시 계산하기](https://www.acmicpc.net/problem/25756)
Tier: Bronze ??
Category: 구현
"""
def solution():
n = int(input())
l = [*map(int, input().split())]
v = 0
for i in l:
v = 1 - (1 - v) * (1 - i / 100)
print(v * 100)
if __name__ == '__main__':
solution()