Input = open("data1.txt","r").read()



ArrInput = Input.split("\n")

Answer = ""

for Number in ArrInput:
    Number = float(Number)
    Number = Number/0.693

    Number = round(Number+499.99,-3)
    Number = str(int(Number))
    
    Answer = Answer + Number + "\n"

    
open("out1.txt","w").write(Answer[:-1])