Nama Оm Vishnu-padaya

Nama Оm Vishnu-padaya 
Krishna-preshthaya bhu-tale  
Srimate bhaktivedanta-svamin iti namine  
Namaste sarasvate deve 
Gaura-Vani-pracarine
Nirvisesha-sunyavadi-
Paschatya-desa-tarine

Namo maha-vadanyaya
 Krishna-prema-pradaya te
 Krishnaya Krishna Chaitanya 
 Namne gaura-tvishe namah

Namo brahmanya-devaya  
Go-brahmana-hitaya ca
Jagad-dhitaya krishnaya
 Govindaya namo namah

You can also chant the Pancha Tattva and Hare Krsna mantras three times:

sri-krishna-chaitanya prabhu-nityananda  sri-advaita gadadhara srivasadi-gaura-bhakta-vrinda
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Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare  Hare Rama, Hare Rama, Rama Rama, Hare Hare