import sys
input = sys.stdin.readline

n = int(input())
s = input()[2:].rstrip()
if(len(s) == 1):
	s += '0'
a = 100 - int(s)

money = 0
now = 100
for _ in [0] * n:
	money = money * 100 + now
	now *= a
s = str(money)
zero = (n - 1) * 2
id = len(s) - zero

ans = ''.join([s[:id],'.',s[id:]]).rstrip('0')
print(ans.rstrip('.'))