static long sumMultiples ( long n ) {
  n -- ;
  return sumAP ( n , 3 ) + sumAP ( n , 7 ) - sumAP ( n , 21 ) ;
}

static long sumMultiples ( long n ) { n -- ; return sumAP ( n , 3 ) + sumAP ( n , 7 ) - sumAP ( n , 21 ) ; }
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