a,b=map(int,input().split())
A,B=a,b
l=-10**30
r=10**30
while True:
  if l==r:
    break
  m=(l+r+1)//2
  K=(a*10**20)//B
  if K>=m:
    l=m
  else:
    r=m-1
t=0
if l<0:
  t=1
l=abs(l)
ans=str(l)
if len(ans)<=20:
  ans='0'*(21-len(ans))+ans
result=ans[:-20]+'.'+ans[-20:]
if t==1:
  result='-'+result
print(result)