static int sumDivisibles ( int A , int B , int M ) {
  int first = findSmallNum ( A , M ) ;
  int last = findLargeNum ( B , M ) ;
  if ( first < A ) first += M ;
  if ( last > B ) first -= M ;
  int n = ( B / M ) - ( A - 1 ) / M ;
  return n * ( first + last ) / 2 ;
}

static int sumDivisibles ( int A , int B , int M ) { int first = findSmallNum ( A , M ) ; int last = findLargeNum ( B , M ) ; if ( first < A ) first += M ; if ( last > B ) first -= M ; int n = ( B / M ) - ( A - 1 ) / M ; return n * ( first + last ) / 2 ; }
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