#include <stdio.h>

int main() {
   int n = 0,
       temp = 0,
       sum = 0;
   char c;

   printf("Integer: ");
   if (scanf("%d%c%d", &n, &c, &temp) <= 2 || n <= 0) {
      printf("Invalid number!\n");
      return 1;
   }
   else
      temp = n;

   
   do {
      sum += temp % 10;
      temp /= 10;
   } while (temp);

   printf("Digit-sum of %d = %d\n", n, sum);  
   return 0;
}