#include <stdio.h>



int main(void)
{
    int i = 0;
    int num = 0;
    int sum = 0;

    printf("Please enter a number\n");
    scanf("%d", &num);

    while(num > 0){

        sum += num%10;
        num /= 10;

    }
    printf("%d", sum);
    return 0;
}