static int minimumSum ( int n ) {
  if ( isPrime ( n ) ) return 1 ;
  if ( n % 2 == 0 ) return 2 ;
  if ( isPrime ( n - 2 ) ) return 2 ;
  return 3 ;
}

static int minimumSum ( int n ) { if ( isPrime ( n ) ) return 1 ; if ( n % 2 == 0 ) return 2 ; if ( isPrime ( n - 2 ) ) return 2 ; return 3 ; }
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