Question: How many meters is Riverbank State Park above the largest river in the state Tito visited when he saw the organization North Korea is a member of?

full_context: Document 1: Chemical weapon: Russia entered the CWC with the largest declared stockpile of chemical weapons. By 2010 the country had destroyed 18,241 tonnes at destruction facilities located in Gorny (Saratov Oblast) and Kambarka (Udmurt Republic), where operations have finished, and Shchuchye (Kurgan Oblast), Maradykovsky (Kirov Oblast), Leonidovka (Penza Oblast) while installations are under construction in Pochep (Bryansk Oblast) and Kizner (Udmurt Republic). By 2016, Russia destroyed around 94% of its chemical weapons, planning to completely destroy its remaining stockpile by the end of 2018. On September 27, 2017 Russia announced the destruction of the last batch of chemical weapons, completing the total destruction of its chemical arsenal, ahead of schedule.On March 4, 2018, Russia was alleged to have conducted a chemical attack in Salisbury, UK that left 5 injured including the alleged target of the attack, Sergei Skripal.
Document 2: Hudson River: The Hudson River is a 315 - mile (507 km) river that flows from north to south primarily through eastern New York in the United States. The river originates in the Adirondack Mountains of Upstate New York, flows through the Hudson Valley, and eventually drains into the Atlantic Ocean, between New York City and Jersey City. The river serves as a political boundary between the states of New Jersey and New York, and further north between New York counties. The lower half of the river is a tidal estuary occupying the Hudson Fjord, an inlet which formed during the most recent period of North American glaciation, estimated at 26,000 to 13,300 years ago. Tidal waters influence the Hudson's flow from as far north as Troy.
Document 3: Josip Broz Tito: Tito visited India from December 22, 1954 through January 8, 1955. After his return, he removed many restrictions on churches and spiritual institutions in Yugoslavia.
Document 4: Israel and weapons of mass destruction: Israel is widely believed to possess weapons of mass destruction, and to be one of four nuclear-armed countries not recognized as a Nuclear Weapons State by the Non-Proliferation Treaty (NPT). The US Congress Office of Technology Assessment has recorded Israel as a country generally reported as having undeclared chemical warfare capabilities, and an offensive biological warfare program. Officially, Israel neither confirms nor denies possessing nuclear weapons.
Document 5: Josip Broz Tito: One significant consequence of the tension arising between Yugoslavia and Soviet Union, was that Tito fought Yugoslav Stalinists with Stalin's methods. In other words, Aleksandar Ranković and the State Security Service (UBDA) employed the same inhumane methods against their opponents as Stalin did in the Soviet Union against his. Not every person accused of a political crime was convicted and nobody was sentenced to death for his or her pro-Soviet feelings. However this repression, which lasted until 1956, was marked by significant violations of human rights.
Document 6: New York City: There are seven state parks within the confines of New York City, including Clay Pit Ponds State Park Preserve, a natural area which includes extensive riding trails, and Riverbank State Park, a 28-acre (110,000 m2) facility that rises 69 feet (21 m) over the Hudson River.
Document 7: New York City: New York City has over 28,000 acres (110 km2) of municipal parkland and 14 miles (23 km) of public beaches. Parks in New York City include Central Park, Prospect Park, Flushing Meadows–Corona Park, Forest Park, and Washington Square Park. The largest municipal park in the city is Pelham Bay Park with 2,700 acres (1,093 ha).
Document 8: New York City: New York City is situated in the Northeastern United States, in southeastern New York State, approximately halfway between Washington, D.C. and Boston. The location at the mouth of the Hudson River, which feeds into a naturally sheltered harbor and then into the Atlantic Ocean, has helped the city grow in significance as a trading port. Most of New York City is built on the three islands of Long Island, Manhattan, and Staten Island.
Document 9: Hoosic River: The Hoosic River, also known as the Hoosac, the Hoosick (primarily in New York) and the Hoosuck (mostly archaic), is a tributary of the Hudson River in the northeastern United States. The different spellings are the result of varying transliterations of the river's original Algonquian name. It can be translated either as "the beyond place" (as in beyond, or east of, the Hudson) or as "the stony place" (perhaps because the river's stony bottom is usually exposed except in spring, or perhaps because local soils are so stony).
Document 10: Saint Lawrence River: The Saint Lawrence River (French: Fleuve Saint - Laurent; Tuscarora: Kahnawáʼkye; Mohawk: Kaniatarowanenneh, meaning ``big waterway '') is a large river in the middle latitudes of North America. The Saint Lawrence River flows in a roughly north - easterly direction, connecting the Great Lakes with the Atlantic Ocean and forming the primary drainage outflow of the Great Lakes Basin. It traverses the Canadian provinces of Quebec and Ontario, and is part of the international boundary between Ontario, Canada, and the U.S. state of New York. This river also provides the basis of the commercial Saint Lawrence Seaway.
Document 11: Chemical Weapons Convention: As of May 2018, 193 states have become parties to the CWC and accept its obligations. Israel has signed but not ratified the agreement, while three other UN member states (Egypt, North Korea and South Sudan) have neither signed nor acceded to the treaty.  Most recently, the State of Palestine deposited its instrument of accession to the CWC on 17 May 2018. In September 2013 Syria acceded to the convention as part of an agreement for the destruction of Syria's chemical weapons.As of November 2018, 96.62% of the world's declared chemical weapons stockpiles had been destroyed. The convention has provisions for systematic evaluation of chemical production facilities, as well as for investigations of allegations of use and production of chemical weapons based on intelligence of other state parties.
Document 12: Josip Broz Tito: Tito's visits to the United States avoided most of the Northeast due to large minorities of Yugoslav emigrants bitter about communism in Yugoslavia. Security for the state visits was usually high to keep him away from protesters, who would frequently burn the Yugoslav flag. During a visit to the United Nations in the late 1970s emigrants shouted "Tito murderer" outside his New York hotel, for which he protested to United States authorities.
Document 13: Appalachian Trail: New York's 88.4 miles (142.3 km) of trail contain very little elevation change compared to other states. From south to north, the trail summits many small mountains under 1,400 feet (430 m) in elevation, its highest point in New York being Prospect Rock at 1,433 feet (437 m), and only 3,000 feet (910 m) from the border with New Jersey. The trail continues north, climbing near Fitzgerald Falls, passing through Sterling Forest, and then entering Harriman State Park and Bear Mountain State Park. The lowest point on the entire Appalachian Trail is in the Bear Mountain Zoo 124 feet (38 m). It crosses the Hudson River on the Bear Mountain Bridge. It then passes through Fahnestock State Park, and continues northeast and crosses the Metro - North Railroad's Harlem Line. This track crossing is the site of the only train station along the trail's length. It enters Connecticut via the Pawling Nature Reserve. The section of the trail that passes through Harriman and Bear Mountain State Parks is the oldest section of the trail, completed in 1923. A portion of this section was paved by 700 volunteers with 800 granite - slab steps followed by over a mile of walkway supported by stone crib walls with boulders lining the path. The project took four years, cost roughly $1 million, and was officially opened in June 2010. The project was done by the New York -- New Jersey Trail Conference. The New York -- New Jersey Trail Conference maintains and updates the Appalachian Trail in New York.
Document 14: Treaty on the Non-Proliferation of Nuclear Weapons: Opened for signature in 1968, the treaty entered into force in 1970. As required by the text, after twenty - five years, NPT Parties met in May 1995 and agreed to extend the treaty indefinitely. More countries have adhered to the NPT than any other arms limitation and disarmament agreement, a testament to the treaty's significance. As of August 2016, 191 states have adhered to the treaty, though North Korea, which acceded in 1985 but never came into compliance, announced its withdrawal from the NPT in 2003, following detonation of nuclear devices in violation of core obligations. Four UN member states have never accepted the NPT, three of which are thought to possess nuclear weapons: India, Israel, and Pakistan. In addition, South Sudan, founded in 2011, has not joined.
Document 15: New York City: Gateway National Recreation Area contains over 26,000 acres (10,521.83 ha) in total, most of it surrounded by New York City, including the Jamaica Bay Wildlife Refuge in Brooklyn and Queens, over 9,000 acres (36 km2) of salt marsh, islands, and water, including most of Jamaica Bay. Also in Queens, the park includes a significant portion of the western Rockaway Peninsula, most notably Jacob Riis Park and Fort Tilden. In Staten Island, the park includes Fort Wadsworth, with historic pre-Civil War era Battery Weed and Fort Tompkins, and Great Kills Park, with beaches, trails, and a marina.
ground_truth: 21
sub_queries: What was Norh Korea a member of? Answer: UN
What American state did Tito visit when he saw the UN ? Answer: New York
what is the largest river in New York Answer: Hudson River
How many meters is Riverbank State Park elevated above Hudson River ? Answer: 21