a,b=map(int,input().split())
m=abs(b-a)
k=m%10

if k==1 or k==5:
  print(m//10+1)
elif k==9 or k==6 or k==4 or k==2:
  print(m//10+2)
elif k==8 or k==7 or k==3:
  print(m//10+3)
else:
  print(m//10)

def cal10(n,t):
  if n<=t:
    return n+10
  else:
    return n-10

def cal5(n,t):
  if n<=t:
    return n+5
  else:
    return n-5

def cal1(n,t):
  if n<=t:
    return n+1
  else:
    return n-1

​now, target =map(int,input().split())

count=0
​
while True:

  if now==target:
    break
  if abs(target-now)>=10:
    now=cal10(now,target)
    count +=1
    continue
  elif abs(target-now)>=5:
    new1=cal10(now,target)
    new2=cal5(now, target)
​
    if abs(target-new1)<abs(target-new2):
      now=new1
    else:
        now=new2
    count+=1
    continue
  else:
    new1=cal5(now,target)
    new2=cal1(now, target)
​
    if abs(target-new1)<abs(target-new2):
      count+=abs(target-new1)+1
    else:
      count+=abs(target-new2)+1
    break
print(count)