#include<stdio.h>
int main()
{
    long long num;
    scanf("%lld",&num);
    long long sum=0;
    while(num!=0)
    {
        sum+=num%10;
        num/=10;
    }
    printf("%lld",sum);
    return 0;
}
```


```

#include<stdio.h>

int main()
{
    long long n, count = 0;
    scanf("%lld", &n);
    while (n)
    {
        count += n % 10;
        n /= 10;
    }
    printf("%lld", count);
    
    return 0;
}