import sys

n = int(input())
r = float(input())
q = 1.0
x = [1.0]
for _ in range(n - 1):
	q *= (1.0 - r)
	x.append(q)
rate = 0.0
print(x, file=sys.stderr)
for xi in reversed(x):
	rate += xi
print(rate * 100.0)