Calendar

SmallNicephorusconstantlyforgetshow old he is.Sohisparentswere hanged inhis room,calendar,wherespecificallymarkedbirthdayNicephorus.Butconsiderhow muchhis age, dateof birth andcurrent dateNicephorusdid notknow how.Help him!

Input

The first line ofthe input filegiven threepositive integers: day, monthandyearof the birth ofNicephorus.The second linegiventhe current datein the same format.Yearsin boththe datesdo not exceed10⁵ andensures that thedate of birthNicephorusstrictlybeforethe current date.

Output

The outputfileoutputa single number- the age ofNicephorus.