What is the population of the country which has Ellen Johnson Sirlea as the 24th president? 
Ellen Johnson Sirleaf: Ellen Johnson Sirleaf (born 29 October 1938) is a Liberian politician who serves as the 24th and current President of Liberia since 2006. Liberia:  It covers an area of 111369 km2 and has a population of 4,503,000 people.
4,503,000