/////kolo zad 7///////

#include <stdio.h>
#include <stdlib.h>
int my_compare (const void * a, const void * b)
{
    int _a = *(int*)a;
    int _b = *(int*)b;
    return ( _b - _a );
}

int main(){
int n, t[1000], i=0;
float mediana;

scanf("%d", &n);
for(i=0;i<n;i++){
    scanf("%d", &t[i]);
}
qsort(t, n, sizeof(t[0]), my_compare);

if((n%2)==0){
    mediana=(t[n/2]+t[(n/2) - 1])/2.0;
}
else if((n%2)!=0){
    mediana=t[n/2];
}
printf("%.1f", mediana);
return 0;
}