Can you solve this riddle?

A man has one phone and wants to dial five different numbers to call five different people. The man can only use the phone ten times. And the man does not know the numbers of the five people he wants to call. He only knows one number and that number isn't the number of any of the five people he wants to call. In the end, he calls all of the people and he ended up dailing the same number he knew from the beginning five times. What is the number that he knew from the beginning?

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