import sys
input = lambda : sys.stdin.readline().rstrip()
sys.setrecursionlimit(max(1000, 10**9))
write = lambda x: sys.stdout.write(x+"\n")

p,q = list(map(int, input().split()))
l = 0
r = 10**9
def sub(x):
    return x<min(q, 1/p + (1-1/p)*(x+1))
for _ in range(100):
    m = (l+r)/2
    if sub(m):
        l = m
    else:
        r = m
print(l)