{"raw_statement":[{"iden":"problem statement","content":"It is known that the area of a regular dodecagon inscribed in a circle of radius $a$ is $3a^2$.\nGiven an integer $r$, find the area of a regular dodecagon inscribed in a circle of radius $r$."},{"iden":"constraints","content":"*   $1 \\leq r \\leq 100$\n*   $r$ is an integer."},{"iden":"input","content":"Input is given from Standard Input in the following format:\n\n$r$"},{"iden":"sample input 1","content":"4"},{"iden":"sample output 1","content":"48\n\nThe area of the regular dodecagon is $3 \\times 4^2 = 48$."},{"iden":"sample input 2","content":"15"},{"iden":"sample output 2","content":"675"},{"iden":"sample input 3","content":"80"},{"iden":"sample output 3","content":"19200"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}