def main():
    P,Q = map(int,input().split())
    
    import math
    
    def is_ok(x):
        return x**2 - (P+Q*x*math.log2(x))<0
        
    y = pow(10,20)
    x = 1
    for _ in range(2000):
        mid = (y+x)/2
        if is_ok(mid):
            x = mid
        else:
            y = mid
    print(x)
main()