def METHOD_NAME(self, mantissa):
    # deposit `mantissa` amount of $eth into its respective compound's ctoken
    # https://compound.finance/docs/ctokens#mint
    for ctoken in self.comptroller.getAllMarkets():
        ctoken = interface.ICErc20Delegate(ctoken, owner=self.safe.account)
        if ctoken.symbol() == "cETH":
            bal_before = ctoken.balanceOf(self.safe)
            ctoken.mint({"from": self.safe.address, "value": mantissa})
            assert ctoken.balanceOf(self.safe) > bal_before
            return
    # for loop did not find $ceth
    raise