Question: What is the population of the country which has Ellen Johnson Sirlea as the 24th president? 

Context articles: George Wallace (diplomat)
Liberia
Thomas Nimely
John F. Kennedy presidential campaign, 1960
Vice President of Liberia
College of West Africa
Human rights in Liberia
Olubanke King Akerele
Ellen Johnson Sirleaf
Norberto Ramírez

George W. Wallace Jr. (born on May 30, 1938) was the foreign minister of Liberia from 2006 to 2007.
 He took office early in 2006, having been appointed to the cabinet of the incoming president Ellen Johnson Sirleaf and confirmed by the Senate.
 Wallace has had a long career as a Liberian diplomat and ambassador through all of its governments during the past several decades.
 In a cabinet reshuffle on August 22, 2007, he was replaced as foreign minister by Olubanka King Akerele and became special adviser to President Johnson Sirleaf instead.
Liberia , officially the Republic of Liberia, is a country on the West African coast.
 It is bordered by Sierra Leone to its west, Guinea to its north and Ivory Coast to its east.
 It covers an area of 111369 km2 and has a population of 4,503,000 people.
 English is the official language and over 20 indigenous languages are spoken, representing the numerous tribes who make up more than 95% of the population.
 The country's capital and largest city is Monrovia.
Thomas Yaya Nimely (born 1956) is a politician in Liberia.
 In 2003 he became the leader of the Movement for Democracy in Liberia (MODEL), which soon became Liberia's second largest rebel group.
 Following the exile of President Charles Taylor, Nimely led his group into the transitional government which was formed on 14 October 2003.
 He then served as the foreign minister of Liberia until February 2006, when the elected President Ellen Johnson Sirleaf took office and established her new cabinet.
The 1960 presidential campaign of John F. Kennedy, a United States Senator from Massachusetts, began on January 2, 1960, when Kennedy formally announced his candidacy for 35th President of the United States, replacing incumbent President of the United States Dwight D. Eisenhower.
 Kennedy was nominated by the Democratic Party at the Democratic National Convention of 1960, taking place between July 11 and July 15, 1960.
 On July 15, 1960, Kennedy named Senator Lyndon B. Johnson of Texas as his official running mate.
 Kennedy and Johnson won the election on November 8, 1960, defeating incumbent Vice President and Republican nominee Richard Nixon, who would later go on to be the 37th President of the United States.
 Kennedy and Johnson were sworn in as 35th President and 37th Vice President of the United States on January 20, 1961 respectively.
 Kennedy would serve as President of the United States until his death in November 1963.
The Vice President of the Republic of Liberia is the second-highest executive official in Liberia, and one of only two elected executive offices along with the President.
 The Vice President is elected on the same ticket with the president to a six-year term.
 In the event of the death, resignation or removal of the president, the Vice President ascends to the presidency, which he or she holds for the remainder of their predecessor's term.
 The Vice President also serves as the President of the Senate and may cast a vote in the event of a tie.
 The current Vice President is Joseph Boakai, serving under President Ellen Johnson Sirleaf.
 He began his term on January 16, 2006.
The College of West Africa is a Methodist high school in Monrovia, Liberia.
 The school was opened in 1839 (as the "Monrovia Seminary"), making it one of the oldest European-style schools in Africa.
 It has produced many of Liberia's leaders and includes among its alumni Liberian President Ellen Johnson Sirleaf, the first woman elected as president in an African state, and Liberian Vice President Joseph Boakai.
Human rights in Liberia became a focus of international attention when the country's president, Ellen Johnson Sirleaf, was named one of the three female co-winners of the 2011 Nobel Peace Prize, all of whom were cited “for their non-violent struggle for the safety of women and for women’s rights to full participation in peace-building work.”
Olubanke King Akerele (born May 11, 1946) is a Liberian politician and diplomat who served as the Minister of Foreign Affairs in the cabinet of Ellen Johnson Sirleaf from October 2007 until her resignation on 3 November 2010.
 She is the granddaughter of Liberia's 17th president, Charles D. B. King.
Ellen Johnson Sirleaf (born 29 October 1938) is a Liberian politician who serves as the 24th and current President of Liberia since 2006.
 Sirleaf is the first elected female head of state in Africa.
Norberto Ramírez Áreas (late 18th century, León, Nicaragua — 11 July 1856, León, Nicaragua) was a Nicaraguan lawyer and politician.
 From 20/23 September 1840 to 7 January 1841 he was the 13th President (called Chief) of El Salvador, still technically a state in the Federal Republic of Central America.
 From 1 April 1849 to 1 April 1851 he was the 24th President (then called Supreme Director) of independent Nicaragua.