# 0J/QsNGA0YXQvtC80LXQvdC60L4=
tol = 1.232E-8
s=13
x=13
def f(x):
return (x+s/x)/2
while True:
tmp = f(x)
if abs(tmp - x) < tol:
break
x = tmp
print(x)
IyAwSi9Rc05HQTBZWFF2dEM4MExYUXZkQzYwTDQ9CnRvbCA9IDEuMjMyRS04CnM9MTMKeD0xMwoKZGVmIGYoeCk6CiAgICByZXR1cm4gKHgrcy94KS8yCgoKd2hpbGUgVHJ1ZToKICAgIHRtcCA9IGYoeCkKICAgIGlmIGFicyh0bXAgLSB4KSA8IHRvbDoKICAgICAgICBicmVhawogICAgeCA9IHRtcAoKcHJpbnQoeCk=