import sys
input = sys.stdin.readline

n = int(input())
_, s = input()[:-1].split('.')
if(len(s) == 1):
	s += '0'
r = 100 - int(s)

dep = 0
now = 100
for _ in [0] * n:
	dep = dep * 100 + now
	now *= r
s = str(dep)
dec_pt = len(s) - (n - 1) * 2

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