Messed up my posts page!!! Help!!!!

Parse error: syntax error, unexpected ‘<‘ in /home/rinohart/public_html/wp-content/themes/lagom/index.php on line 28

Above is the message I get now when I go to my webpage where my posts are. Below is the code for that page from the theme editor. Can anyone please tell me what I’ve done?!?!?!

[code moderated – please use the pastebin – which will keep the formatting and show line numbers]