The missing crown jewels

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You stand before the statue of the Horse and the Lion.
Now you read the small paper that the guard gave you.

It says:
Help me count how many green storks that fly by with yellow boys on their backs from left to right.

I have tried so many times but cannot get it right!

Solve the task and receive my blood as a reward – it can be used together with the stamp as ink!

Yours, the Horse.

Enter the answer here: (x)

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