It depends on the levels of the players. Assuming they're starting at level three, four wolves would be an easy encounter, which would be good for new players. Seven wolves would be hard, which could be fun for people that like to minmax. If they're level 1 instead, 2 wolves is a medium level encounter, and 3 is deadly. There are some sites like koboldplus.club that you can use to determine the difficulty of an encounter. 
However, it's important to remember that adding tactics will bump up the difficulty, potentially making easy encounters hard or hard encounters deadly. So, if they're having trouble, you may want to have the wolves make a few blunders so your players can have fun.
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