import numpy as np

def main():
    specific_impulse = 200
    m_burnout = 300
    v_burnout = 1000
    g = 9.81

    m_launch = m_burnout * np.exp(v_burnout / (specific_impulse*g))
    m_initial = m_launch - m_burnout
    
    print(m_initial)


if __name__ == "__main__":
    main()