#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
int main()
{
    int n;
    if (scanf("%d", &n) != 1) {
        return 1;
    }
    if (n < 0) {
        return 0;
    }
    int sum_even = 0;
    int sum_odd = 0;
    char initial;
    for (int i = 0; i < n; ++i) {
        while (scanf("%c", &initial) == 1 && isspace(initial));
        if (!isalpha(initial)) {
            return 0;
        }
        if ((int)initial % 2 == 0) {
            sum_even += (int)initial;
        } else {
            sum_odd += (int)initial;
        }
    }
    int balance = abs(sum_even - sum_odd);
    printf("%d\n", balance);
    ret
}