A bank has total assets of $3 billion, including cash of $1 billion and loan portfolio of $2 billion. The loan portfolio is comprised of 40% personal loans, 30% auto loans, and 30% small business loans. Personal loans are assigned a risk weight of 100%, auto loans are assigned a risk weight of 50%, and small business loans are assigned a risk weight of 75%. The bank's total risk-weighted assets is $______million.