Given the task definition and input, reply with output. In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: How many men did the Romans lose in total from these battles? Passage 1:Having recovered from their losses at Trebia (218 BC) and Lake Trasimene (217 BC), the Romans decided to engage Hannibal at Cannae, with approximately 86,000 Roman and allied troops. They massed their heavy infantry in a deeper formation than usual, while Hannibal used the double envelopment tactic and surrounded his enemy, trapping the majority of the Roman army, who were then slaughtered. The loss of life on the Roman side was one of the most lethal single day's fighting in history; Adrian Goldsworthy equates the death toll at Cannae to "the massed slaughter of the British Army on the first day of the Somme offensive in 1916." Only about 15,000 Romans, most of whom were from the garrisons of the camps and had not taken part in the battle, escaped death. Following the defeat, Capua and several other Italian city-states defected from the Roman Republic to Carthage.
 Passage 2:Antananarivo (French: Tananarive, ), also known by its colonial shorthand form Tana, is the capital and largest city of Madagascar. The larger urban area surrounding the city, known as Antananarivo-Renivohitra ("Antananarivo-Mother Hill" or "Antananarivo-Capital"), is the capital of Analamanga region. The city sits at above sea level in the center of the island, the highest national capital by elevation among the island countries. It has been the country's largest population center since at least the 18th century. The presidency, National Assembly, Senate and Supreme Court are located there, as are 21 diplomatic missions and the headquarters of many national and international businesses and NGOs. It has more universities, nightclubs, art venues, and medical services than any city on the island. Several national and local sports teams, including the championship-winning national rugby team, the Makis are based here.
 Passage 3:Stacy Morasco, younger sister to Gigi, is first seen on February 6, 2009 as a Las Vegas stripper named "Gigi." She begins spying on Gigi and Rex Balsom, later following them back to Llanview. Gigi is thrilled to see her, but devastated by the news that their parents had died in a car crash years before, and Stacy's own struggles since. Stacy makes fast friends with Gigi and Rex's son Shane, although Gigi is somewhat uncomfortable with Stacy's influence. Gigi also begins to suspect that her sister is trying to seduce Rex. After Shane is diagnosed with leukemia in March 2009, Stacy learns of a matching donor. Wanting Rex for herself, she pretends that she is the match and forces Gigi to break up with Rex in exchange for her blood. Shane receives the transplant and improves, but Gigi is afraid to reveal Stacy's blackmail in case Shane needs more of her stem cells. Eventually, Gigi tells the truth, but in the meantime Stacy and Rex have slept together. Rex and Gigi reunite as Stacy's blackmail is revealed. Rex spurns Stacy, but she discovers that she is pregnant. She miscarries but keeps the truth from Rex knowing that it is her only hold over him. Stacy calls her stripper best friend Kimberly Andrews to come to Llanview, who comes up with a plan to help get Stacy pregnant again to pass the baby off as Rex's. She drugs ex-boyfriend Schuyler Joplin but he refuses her. She becomes pregnant after seducing a drunken Oliver Fish. In November 2009 Schuyler finds out that Stacy lost her baby with Rex, and Kim tells Schuyler that he is the baby's father. Schuyler agrees to keep the truth from Rex so that he can have Gigi for himself. In January 2010 Rex's crazed biological father Mitch Laurence tries to kidnap Stacy to raise her baby as his heir. Kim and Stacy tells Schuyler to steal a drug called oxytocin so Stacy can give birth a month before her due date to pass the baby as Rex's. On February 2, 2010 Stacy is kidnapped by Mitch Laurence. When she reveals that the baby is not Rex's, Mitch abandons Stacy in a blizzard. Gigi finds her, takes her to a cabin, and on February 11, 2010 helps Stacy deliver a baby girl she names Sierra Rose. On February 16, 2010, Stacy falls through the ice of a frozen lake; despite Rex and Oliver's attempts to save her, she disappears beneath the ice and is presumed dead. Days later, Stacy's spirit appears to Kim several times to get Kim's assurance that she will do all she can to care for Sierra.
1