/* This program reads molar concentrations until
   end-of-file. For each molar concentration mc,
   it computes the corresponding pH using the
   formula

                  pH = -log10( mc )

   It then reports whether the solution is acidic
   (pH < 7) or nonacidic.
*/

#include <stdio.h>
#include <math.h>

main()
{
   float mc, ph;

   while ( scanf( "%f", &mc ) != EOF ) {
      ph = -log10( mc );
      printf( "\nMolar concentration = %e\n", mc );
      printf( "pH = %f\n", ph );
      if ( ph < 7.0 ) {
        printf( "Acidic\n" );
	printf(" You've found an acid.\n");
	}
      else
         printf( "Nonacidic\n" );
   }
}