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We obtain estimates for the complexity of the implementation of  n -place Boolean functions by circuits and formulas built of unbounded fan-in conjunction and disjunction gates and either negation gates or negations of variables as inputs. Restrictions on the depth of circuits and formulas are imposed. In a number of cases, the estimates obtained in the paper are shown to be asymptotically sharp. In particular, for the complexity of circuits with variables and their negations on inputs, the Shannon function is asymptotically estimated as2  ⋅   2   n  /  2    ;    $2\cdot {{2}^{n/2}};$   this estimate is attained on depth-3 circuits.

On the complexity of bounded-depth circuits and formulas over the basis of fan-in gates