static int largestCoprime ( int N ) {
  if ( N == 6 ) return 1 ;
  else if ( N % 4 == 0 ) return ( N / 2 ) - 1 ;
  else if ( N % 2 == 0 ) return ( N / 2 ) - 2 ;
  else return ( ( N - 1 ) / 2 ) ;
}

static int largestCoprime ( int N ) { if ( N == 6 ) return 1 ; else if ( N % 4 == 0 ) return ( N / 2 ) - 1 ; else if ( N % 2 == 0 ) return ( N / 2 ) - 2 ; else return ( ( N - 1 ) / 2 ) ; }
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