1. Rama Stotra in the Vishnu Sahasranama, say this sloka 3 times as mentioned in the sahasranama.
Sri Rama Rama Rameti Rame Raame Manorame
Sahasra Nama Tat Tulyam Rama Nama Varanane
Sri Rama Nama Varanane Iti
2. Next one is what we learnt when we were all young.
Ramaya Rama Bhadraya Ramachandraya Vedhase
Raghu Nathaya Nathaya Sitayah Pataye Namaha
3. And of course, Hare Rama Hare Rama
Hare rama hare rama rama rama hare hare
Hare Krishna hare Krishna krishna krishna hare hare