"ECB borrows $$300,000$ USDs by issuing $5-$year bonds. ECB's cost of debt is $5\%,$ so it will need to pay $$15,000$ USDs in interest each year for the next $5$ years, and then repay the principal $$300,000$ USD in year $5.$ ECB's marginal tax rate will remain $35\%$ throughout this period. By how much $($in USDs$)$ does the interest tax shield increase the value of ECB? Note: Express your answers in strictly numerical terms. For example, if the answer is $$500,$ enter $500$ as an answer."