Instructions: 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.
Input: Question: How old was Mihailov when the Second Blakan War began? Passage 1:Pointon was born in Evesham, Worcestershire. He began his football career as an amateur with Coventry City and Redditch Town before joining Birmingham, still as an amateur, in August 1913. The club were fined £5 for playing him in the reserves before the transfer formalities had been completed. An outside left, his performances in the reserves were such that he was invited to a trial for England's amateur team, which proved unsuccessful. He made his debut in the Second Division on New Year's Day 1914 in a 2–0 defeat at Stockport County, and played three times more that season, scoring once, but left in April 1914. He played briefly for Redditch, then joined Walsall shortly before the First World War started. After the war he had a season with Nuneaton Town before returning to the Football League with Coventry City. He played twice in the Second Division for Coventry before a third spell with Redditch and finishing his career at Tamworth Castle.
 Passage 2:The main components for water-powered stamp mills – water wheels, cams, and hammers – were known in the Hellenistic era in the Eastern Mediterranean region. Ancient cams are in evidence in early water-powered automata from the third century BC. A passage in the Natural History of the Roman scholar Pliny (NH 18.23) indicates that water-driven pestles had become fairly widespread in Italy by the first century AD: "The greater part of Italy uses an unshod pestle and also wheels which water turns as it flows past, and a trip-hammer [mola]". These trip-hammers were used for the pounding and hulling of grain. Grain-pounders with pestles, as well as ordinary watermills, are also attested as late as the middle of the fifth century in a monastery founded by Romanus of Condat in the remote Jura region, indicating that the knowledge of trip hammers continued into the early Middle Ages. Apart from agricultural processing, archaeological evidence also strongly suggests the existence of trip hammers in Roman metal working. In Ickham in Kent, a large metal hammer-head with mechanical deformations was excavated in an area where several Roman water-mills and metal waste dumps have also been traced.
 Passage 3:Ivan Mihailov was born on 26 August 1896, in the village of Novo Selo (now part of Štip Municipality, North Macedonia) in the Kosovo Vilayet of the Ottoman Empire. Mihailov studied at the Bulgarian Men's High School in Thessaloniki up until the Second Balkan War when the school was closed by the new Greek administration, he later continued his studies at a Serbian school in Skopje. He was offered a scholarship by the Serbian Ministry of Education to pursue a degree at a European university but declined, later enlisting in the Bulgarian army, which had by that time occupied a significant portion of the region. After the end of World War I, Mihailov emigrated to Bulgaria, settling in Sofia. Here he began studying law at the Sofia University, at which time he was contacted by IMRO activists and offered to work as a personal secretary for IMRO's leader at that time, Todor Aleksandrov.

Output:
3