Hello guys,

Today, I am facing a serious problem, I get idea, but I don't is it possible to do it.

Assume that, I have a number `n`

and I want to calculate count numbers that is co-prime to `n`

and it is also in range `[L, R]`

I read `totient Euler`

but I think it won't help me ...

Thanks so much for trying to understand my poor English. :(

After reading this you should be able to solve the problem for N,L,R<=1e18

Thanks sir, let me read it :D