#include <stdio.h>
#include <stdlib.h>

int compare(const void* value1, const void* value2)
{
	return *(const double*)value1 - *(const double*)value2;
}

int main()
{
	size_t size = 0;
	if ( scanf("%zu", &size) != 1 )
		return 1;

	double vector[size];
	for ( size_t counter = 0; counter < size; ++counter )
		if ( scanf("%lg", &vector[counter]) != 1 )
			return 2;

	qsort(vector, size, sizeof(double), compare);

	if ( size % 2 == 1 )
		printf("\nmedian=%lg\n", vector[size / 2] );
	else
		printf("\nmedian=%lg\n", (vector[size / 2] + vector[size / 2 - 1]) / 2.0 );

	printf("size=%zu\n", size);
	for ( size_t counter = 0; counter < size; ++counter )
		printf("%zu: %lg\n", counter, vector[counter]);

	return 0;
}