3120 : 리모컨 

a,b = map(int,input().split())
sum = 0
target11 = abs(a-b)
while target11 != 0:
  if target11 >= 8:
    target11 = abs(target11 - 10)
    sum = sum+1
  elif target11 <8 and target11 >=3:
    target11 = abs(target11 - 5)
    sum = sum+1
  elif target11 <3 and target11 >=1:
    target11 = abs(target11 - 1)
    sum = sum+1
print(sum)

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