Question: About how many people are in executive branch of the Senate in the city where the employer of Rudolf Löb is headquartered?

full_context: Document 1: Gerson von Bleichröder: Bleichröder was born in Berlin. He was the eldest son of Samuel Bleichröder, who founded the banking firm of S. Bleichröder in 1803 in Berlin. Gerson first joined the family business in 1839. In 1855 upon the death of his father, Gerson became the head of the banking firm. The bank maintained close contacts with the Rothschild family; the banking house of Bleichröder acted as a branch office in Berlin of the Rothschilds' bank.
Document 2: States of Germany: The governments in Berlin, Bremen and Hamburg are designated by the term Senate. In the three free states of Bavaria, Saxony, and Thuringia the government is referred to as the State Government (Staatsregierung), and in the other ten states the term Land Government (Landesregierung) is used. Before January 1, 2000, Bavaria had a bicameral parliament, with a popularly elected Landtag, and a Senate made up of representatives of the state's major social and economic groups. The Senate was abolished following a referendum in 1998. The states of Berlin, Bremen, and Hamburg are governed slightly differently from the other states. In each of those cities, the executive branch consists of a Senate of approximately eight, selected by the state's parliament; the senators carry out duties equivalent to those of the ministers in the larger states. The equivalent of the Minister-President is the Senatspräsident (President of the Senate) in Bremen, the Erster Bürgermeister (First Mayor) in Hamburg, and the Regierender Bürgermeister (Governing Mayor) in Berlin. The parliament for Berlin is called the Abgeordnetenhaus (House of Representatives), while Bremen and Hamburg both have a Bürgerschaft. The parliaments in the remaining 13 states are referred to as Landtag (State Parliament).
Document 3: Henry Lehman: In 1855, Henry Lehman died from yellow fever while travelling in New Orleans. Later, his brothers moved the company's headquarters to New York City, eventually building it into an important American investment bank, which was in operation for over 150 years until its September 15, 2008 collapse.
Document 4: Edinburgh: Banking has been a mainstay of the Edinburgh economy for over 300 years, since the Bank of Scotland (now part of the Lloyds Banking Group) was established by an act of the Scottish Parliament in 1695. Today, the financial services industry, with its particularly strong insurance and investment sectors, and underpinned by Edinburgh-based firms such as Scottish Widows and Standard Life Aberdeen, accounts for the city being the UK's second financial centre after London and Europe's fourth in terms of equity assets. The Royal Bank of Scotland opened new global headquarters at Gogarburn in the west of the city in October 2005, and Edinburgh is home to the headquarters of Bank of Scotland, Sainsbury's Bank, Tesco Bank, TSB Bank and Virgin Money.
Document 5: Mendelssohn & Co.: Mendelssohn & Co. survived the financial meltdown of the 1930s comparatively well. Following the death of Franz von Mendelssohn and in 1935, Rudolf Löb was appointed as chairman of the bank, the first non-family member to be chairman. In 1938, under intense pressure of the Nazis' Aryanization policy, Mendelssohn & Co. were forced to hand over their assets to Deutsche Bank, and eventually to shut down.
Document 6: Mendelssohn & Co.: It was established in 1795 by Joseph Mendelssohn in Berlin. In 1804, his younger brother Abraham Mendelssohn Bartholdy joined the company. In 1815, they moved into their new headquarters at Jägerstraße 51, thereby laying the foundations of Berlin's financial district. Mendelssohn & Co. remained in that building until its divestiture in 1939.
Document 7: Knorr-Bremse: Engineer Georg Knorr established "Knorr-Bremse GmbH" in 1905 in Boxhagen-Rummelsburg, Neue Bahnhofstraße, near Berlin (since 1920 part of Berlin-Friedrichshain). Its production of railway braking systems derived from a company ("Carpenter & Schulze") founded in 1883. In 1911 the company merged with "Continentale Bremsen-GmbH" to found "Knorr-Bremse Aktiengesellschaft" (AG). From 1913 onwards, a second manufacturing plant, new headquarters, a heating plant and other annex buildings were erected.
Document 8: Geography of Germany: Germany comprises sixteen states that are collectively referred to as Länder. Each state has its own state constitution and is largely autonomous in regard to its internal organisation. Due to differences in size and population the subdivision of these states varies, especially between city states (Stadtstaaten) and states with larger territories (Flächenländer). For regional administrative purposes five states, namely Baden - Württemberg, Bavaria, Hesse, North Rhine - Westphalia and Saxony, consist of a total of 22 Government Districts (Regierungsbezirke). As of 2009 Germany is divided into 403 districts (Kreise) on municipal level, these consist of 301 rural districts and 102 urban districts.
Document 9: Leo Arons: Leo Arons came from a wealthy Jewish banking family in Berlin. His parents were Albert Arons (1826-1897), a partner in the prestigious private banking house "Gebrüder Arons", and Clara Goldschmidt (1837-1867). In 1887 Leo Arons married Johanna Bleichröder (1861-1938), a daughter of the banker Julius Bleichröder (1828-1907). Arons' brother, the banker Paul Arons (1861-1932), married Johanna's sister Gertrude (1865-1917) a few years later.
Document 10: Rudolf Leopold: Rudolf Leopold (1 March 1925 – 29 June 2010) was an Austrian art collector, whose collection of 5,000 works of art was purchased by the Government of Austria and used to create the Leopold Museum, of which he was made director for life. Claims had been made by Jewish survivors of the Holocaust that some of the pieces in the collection were Nazi plunder and should be returned to their rightful owners.
Document 11: States of Germany: Local associations of a special kind are an amalgamation of one or more Landkreise with one or more Kreisfreie Städte to form a replacement of the aforementioned administrative entities at the district level. They are intended to implement simplification of administration at that level. Typically, a district-free city or town and its urban hinterland are grouped into such an association, or Kommunalverband besonderer Art. Such an organization requires the issuing of special laws by the governing state, since they are not covered by the normal administrative structure of the respective states.
Document 12: Johann von Berenberg-Gossler: Baron Johann von Berenberg-Gossler (born 13 February 1839 in Hamburg, died 8 December 1913 in Hamburg; né Johann Gossler), known as "John," was a German banker from the city-state of Hamburg and owner and head of Berenberg Bank from 1879 until his death.
Document 13: Rudolf Löb: Rudolf Löb (November 21, 1877 – January 30, 1966) was a German banker with Mendelssohn & Co. and consultant to the German and Russian governments.
Document 14: Joint Senate of the Supreme Courts of the Federation: The Joint Senate of the Federal Supreme Courts of Justice ("Gemeinsamer Senat der Obersten Gerichtshöfe des Bundes", also called the "Common Senate") is often regarded as one of the supreme courts of justice in Germany, but it is rather, as its name suggests, an "ad hoc" judicial body that is convened only in specific cases. The Joint Senate consists of the Presidents of the five Federal Supreme Courts (excluding the Federal Constitutional Court) and two members of each of the Senates involved ("Senate" here denotes a judicial 'sub-unit' within a court, usually consisting of three or more judges, with all Federal Supreme Courts and subordinate courts of appeal being divided into several senates). The Joint Senate decides on questions regarding the interpretation of law that are relevant for all five branches of law overseen by the five Federal Supreme Courts.
Document 15: States of Germany: The Districts of Germany (Kreise) are administrative districts, and every state except the city-states of Berlin, Hamburg, and Bremen consists of "rural districts" (Landkreise), District-free Towns/Cities (Kreisfreie Städte, in Baden-Württemberg also called "urban districts", or Stadtkreise), cities that are districts in their own right, or local associations of a special kind (Kommunalverbände besonderer Art), see below. The state Free Hanseatic City of Bremen consists of two urban districts, while Berlin and Hamburg are states and urban districts at the same time.
ground_truth: eight
sub_queries: Rudolf Löb >> employer Answer: Mendelssohn & Co.
Mendelssohn & Co. >> headquarters location Answer: Berlin
How many people are in the executive branch senate in Berlin ? Answer: eight