A recursive function is defined by f(n)=f(n−1)+3f(n) = f(n-1) + 3f(n)=f(n−1)+3 for n≥1n \ge 1n≥1, with f(0)=5f(0) = 5f(0)=5. What is the value of f(3)f(3)f(3)?
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20