U2515HC, two, Lenovo HDMI, no DP?

Hi, I have purchased two used Dell U2515HC monitors to extend my screen workspace and open more than one program at the same time. My Lenovo laptop has one HDMI port, and no DP port. The salesman gave me two HDMI wires. Would purchasing a HDMI adapter with two HDMI ports for screen connection work? The manual I saw online does not show dual screen setup to a laptop with only a HDMI port. I saw an almost similar question from another Dell user, and seems HDMI setup does not work for her DELL screens. As a trial I connected each screen alone with an HDMI wire to the laptop and both work. I need to know before I purchase the expensive dual HDMI adapter.