My cat keeps to himself most of the time

My cat keeps to himself most of the time. I only heard him meow, hiss, and purr on one day out of the last 23 days. But I did hear him make at least one of these sounds each day. I heard him hiss on 6 days, purr on 12 days, and meow on 15 days. On 2 days, I heard him meow and hiss but not purr, and on 2 days, I heard him purr and hiss but not meow. On how many days did I hear him meow and purr but not hiss?

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