Task: Question Answering
Input (English): Passage: Set in the 1950s, the film begins in medias res near the end of the story, with a confrontation between two men: one of them, Clare Quilty, drunk and incoherent, plays Chopin's Polonaise in A major, Op. 40, No. 1 on the piano before being shot from behind a portrait painting of a young woman. The shooter is Humbert Humbert, a 40-something British professor of French literature.
The film then flashes back to events four years earlier. Humbert arrives in Ramsdale, New Hampshire, intending to spend the summer before his professorship begins at Beardsley College, Ohio. He searches for a room to rent, and Charlotte Haze, a cloying, sexually frustrated widow, invites him to stay at her house. He declines until seeing her daughter, Dolores, affectionately called "Lolita". Lolita is a soda-pop drinking, gum-snapping, overtly flirtatious teenager, with whom Humbert becomes infatuated.
To be close to Lolita, Humbert accepts Charlotte's offer and becomes a lodger in the Haze household. But Charlotte wants all of "Hum's" time for herself and soon announces she will be sending Lolita to an all-girl sleepaway camp for the summer. After the Hazes depart for camp, the maid gives Humbert a letter from Charlotte, confessing her love for him and demanding he vacate at once unless he feels the same way. The letter says that if Humbert is still in the house when she returns, Charlotte will know her love is requited, and he must marry her. Though he roars with laughter while reading the sadly heartfelt yet characteristically overblown letter, Humbert marries Charlotte.
Things turn sour for the couple in the absence of the child: glum Humbert becomes more withdrawn, and brassy Charlotte more whiny. Charlotte discovers Humbert's diary entries detailing his passion for Lolita and characterizing her as "the Haze woman, the cow, the obnoxious mama, the brainless baba". She has a hysterical outburst, runs outside, and is hit by a car, dying on impact. 
Question: What is the first name of the person who roars with laughter?
Output (English): Humbert.