What is the test for determining whether a sentence is too lenient?

exceptional cases where the trial court's decision cannot be located within the range of permissible decisions." Id. at 189 (citation, internal quotation marks, and emphasis omitted). A sentence falls outside the range of permissible decisions when, "although procedurally correct, [affirming] would nonetheless damage the administration of justice because the sentence imposed was shockingly high, shockingly low, or otherwise unsupportable as a matter of law." United States v. Rigas, 583 F.3d 108, 123 (2d Cir. 2009).