#include <stdio.h>

main() {
    int min = -1000, max = 1000;
    
    int count;
    int num[1000];
    
    scanf("%d", &count);
    for (int i=0; i<count; i++)
        scanf("%d", &(num[i]));
    
    // bubble sort
    while (1) {
        int flag = 0;
        for (int i=0; i<count-1; i++) {
            if (num[i] > num[i+1]) {
                int value = num[i];
                num[i] = num[i+1];
                num[i+1] = value;
                
                flag = 1;
            }
        }
        
        if (flag == 0)
            break;
    }
    
    if (count % 2 == 1) {
        printf("%d\n", num[count/2]);
    } else {
        printf("%f\n", (((float)num[count/2]) + num[count/2-1])/2);
    }
}