What a terrible business model!

A stationary shop that I know of sells pens in bundles of 6 and 7 only. In all the transactions that I've made with the shop so far, I managed to buy exactly \(N, N+1,N+2, N+3,\) and \(N+4\) pens. However, I was never able to buy \(N+5\) pens no matter what combination of the two bundles I tried.

What is \(N?\)

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