Is it possible ???

I've been disappointed for 5 hours and I can't do it... i need your help ! Could someone write me the formula? I don't even know if it's possible.

I need this : 
Each time in this data range [F3:F17 ] it is noted "Thomas" and if in this data range [K3:K17] it is noted "RDV" or "En" then you must add +1 in this box

if you succeed, ty :)