CF714A Meeting of Old Friends

Today an outstanding event is going to happen in the forest — hedgehog Filya will come to his old fried Sonya! Sonya is an owl and she sleeps during the day and stay awake from minute $ l_{1} $ to minute $ r_{1} $ inclusive. Also, during the minute $ k $ she prinks and is unavailable for Filya. Filya works a lot and he plans to visit Sonya from minute $ l_{2} $ to minute $ r_{2} $ inclusive. Calculate the number of minutes they will be able to spend together.

The only line of the input contains integers $ l_{1} $ , $ r_{1} $ , $ l_{2} $ , $ r_{2} $ and $ k $ ( $ 1

Print one integer — the number of minutes Sonya and Filya will be able to spend together.

In the first sample, they will be together during minutes $ 9 $ and $ 10 $ . In the second sample, they will be together from minute $ 50 $ to minute $ 74 $ and from minute $ 76 $ to minute $ 100 $ .