import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
mod=10**9+7

def main():
    import math
    P,Q=MI()
    
    def f(x):
        return x**2<=P+Q*x*math.log2(x)
    
    ok=1
    ng=10**16
    
    for _ in range(10**5):
        x=(ok+ng)/2
        if f(x):
            ok=x
        else:
            ng=x
            
    print(ok)
    
    


main()