Task: Question Answering
Input (English): Passage: The legacy of the California Gold Rush turned San Francisco into the principal banking and finance center of the West Coast in the early twentieth century. Montgomery Street in the Financial District became known as the "Wall Street of the West", home to the Federal Reserve Bank of San Francisco, the Wells Fargo corporate headquarters, and the site of the now-defunct Pacific Coast Stock Exchange. Bank of America, a pioneer in making banking services accessible to the middle class, was founded in San Francisco and in the 1960s, built the landmark modern skyscraper at 555 California Street for its corporate headquarters. Many large financial institutions, multinational banks, and venture capital firms are based in or have regional headquarters in the city. With over 30 international financial institutions, six Fortune 500 companies, and a large support infrastructure of professional services—including law, public relations, architecture and design—San Francisco is designated as an Alpha(-) World City. The 2017 Global Financial Centres Index ranked San Francisco as the sixth most competitive financial center in the world.
Since the 1990s, San Francisco's economy has diversified away from finance and tourism towards the growing fields of high tech, biotechnology, and medical research. Technology jobs accounted for just 1 percent of San Francisco's economy in 1990, growing to 4 percent in 2010 and an estimated 8 percent by the end of 2013. San Francisco became an epicenter of Internet start-up companies during the dot-com bubble of the 1990s and the subsequent social media boom of the late 2000s (decade). Since 2010, San Francisco proper has attracted an increasing share of venture capital investments as compared to nearby Silicon Valley, attracting 423 financings worth US$4.58 billion in 2013. In 2004, the city approved a payroll tax exemption for biotechnology companies to foster growth in the Mission Bay neighborhood, site of a second campus and hospital of the University of California, San Francisco (UCSF). Mission Bay hosts the UCSF Medical Center, the California Institute for Regenerative Medicine, California Institute for Quantitative Biosciences, and Gladstone Institutes, as well as more than 40 private-sector life sciences companies. 
Question: What is the worth in US dollars of the 423 financings of 2013 in the city that is the principal banking and finance center of the West Coast?
Output (English): $4.58 billion.