Lazy Shash

Shash is a lazy guy. He has to do $N$ tasks and, as usual, decides to distribute them among others. For each task, he knows two values, $L[i]$ and $R[i]$ indicating that the completion of the task requires someone to work on in from time $L[i]$ to $R[i]$ (both inclusive). One person can only work on a single task at any point. Shash knows that he has an image for not doing much work himself and wo