How much Sacred Coins do you need for update armored Boots?

Hi, I have like ~100 sacred coins (is that the english name?) and I would like to know how much I need for upgrading Armored Boots new sacred seal. Its 50 or 100? I mean, the 90% of sacred seals are first 50 sacred coins and then 100 sacred coins to get the level 3 but, some other sacred seals needs 100 directly. Does know someone how much Armored Boots needs in the first upgrade? (sorry my bad english)