Narayanastram is the combination of one shloka of sri valmiki ramayana one shloka of srimat bhagavadgeetha and one namam from vishnu sahasra namam. Everyone will get different set of shlokas. Everyone has to chant everyday. As a result everyone gets the grand fruit of chanting entire ramayana, entire geetha and entire vishnu sahasra nama stothram.