Sum of unique users that...

Hi! 

Let’s say I have a view looking like the table below. The table shows the Customer id and what store they visited at some point in time. How do I create a measure that calculates the count of unique customers that have visited more than 1 different stores? 

CUSTOMER STORE
123 55
123 23
111 52
111 52
142 85
125 22
117 46
193 71

Thank you in advance! 

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