static int xorFirstNPrime ( int n ) {
  int count = 0 , num = 1 ;
  int xorVal = 0 ;
  while ( count < n ) {
    if ( prime [ num ] ) {
      xorVal ^= num ;
      count ++ ;
    }
    num ++ ;
  }
  return xorVal ;
}

static int xorFirstNPrime ( int n ) { int count = 0 , num = 1 ; int xorVal = 0 ; while ( count < n ) { if ( prime [ num ] ) { xorVal ^= num ; count ++ ; } num ++ ; } return xorVal ; }
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