public static void main ( String [ ] args ) {
  long q , n , a , b , cost ;
  Scanner sc = new Scanner ( System . in ) ;
  q = sc . nextLong ( ) ;
  while ( q -- > 0 ) {
    n = sc . nextLong ( ) ;
    a = sc . nextLong ( ) ;
    b = sc . nextLong ( ) ;
    cost = ( long ) ( Math . ceil ( n / 2 ) * Math . min ( 2 * a , b ) + ( n % 2 ) * a ) ;
    System . out . println ( cost ) ;
  }
}

public static void main ( String [ ] args ) { long q , n , a , b , cost ; Scanner sc = new Scanner ( System . in ) ; q = sc . nextLong ( ) ; while ( q -- > 0 ) { n = sc . nextLong ( ) ; a = sc . nextLong ( ) ; b = sc . nextLong ( ) ; cost = ( long ) ( Math . ceil ( n / 2 ) * Math . min ( 2 * a , b ) + ( n % 2 ) * a ) ; System . out . println ( cost ) ; } }
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