Countries A and $B$ have infinitely elastic export supplies for a particular good, with A being the low$-$cost producer. Country $C$ is a small importing country. Country $C$ initially has a non$-$discriminatory tariff on imports from both A and $B.$ In this initial equilibrium, country $C$ imports $1,000$ units and the price in country $C$ is $80.$

Subsequently, countries B and C agree to free trade, but country $C$ continues to levy the same original tariff on country $A.$

Given the information in the figure, what is the value of trade diversion?