How can I get number of property with SWRL rule in Protege

Question

I want to write a rule to get the number of assets owned by a network and check if it is greater than 3. So I wrote the SWRL rule as:

Network(?n)^(hasAsset\>3)(?n)-\>NetworkhasManyAssets(?n)

But the Protege says "Unexpected character \>"

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How to modify the rule.