[t006] sumdigit

#include <stdio.h>
long DigitSum(long n1)
{
    if(n1 == 0)
        return 0;
    else
    return ((n1 % 10) + DigitSum(n1 / 10));
}
int main()
{
    long n1, sum;
    scanf("%ld", &n1);
    sum = DigitSum(n1);
    printf("%ld",sum);
    return 0;
}