Time Limit: Java: 5000 ms / Others: 5000 ms

Memory Limit: Java: 32768 KB / Others: 32768 KB

In order to celebrate the 8th anniversary of ZOJ, LCLL goes to a sauce factory to "Get Sauce". The factory has N kinds of materials. If we combine some of them, we will get a bottle of sauce. LCLL is a sauce genius, he knows about M ways to make the sauce with these materials. Now LCLL wants to get as many bottles of sauce as possible, but he can use each kind of material only once. How many bottles of sauce will LCLL take home at most?

The input file will contain multiple test cases. Each case contains two integers N and M(0 <=N <= 16, 0<= M <=50,000), then there are M lines, each line describe a way to make sauce like this: K a1,a2...aK where K(1<=K<=N) is the number of kinds of materials, ai is a number between[1,N] represents a kind of material this way needs.

Process to the end-of-file.

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