#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
int main()
{
    int n;
    char arr[100];
    int evenSum-0, oddSum-0;
    scanf("%d",&n);
    if (n<1 || n>100)
    {
        printf("Invalid input\n");
        return 0;
    }
    for (int i=0; i<n; i++)
    {
        scanf("%d", arr[i]);
        if (isalpha(arr[i]))
        {
            printf("Invalid input\n");
            return 0;
        }
    }
    char *ptr=arr;
    for (int i=0; i<n; i++)
    {
        int ascii = (int)*(ptr+i);
        if (ascii % 2==0)
            evenSum+=ascii;
        else
            oddSum+=ascii;
    }
    printf("%d\n",ptr(evenSum, oddSum));
    return 0;
}