#include <stdio.h>
int main()
{
  double n;
  int m, valid, t, remainder;
  int sum = 0;
 
  printf("Integer: ");
  valid = scanf("%lf", &n);
  m = (int) n;
  valid = valid + (n > 0)+(m == n);
  if (valid != 3){
    printf("Invalid number!\n");
    return 0;
  }
  t = m;
  while (t != 0)
    {
      remainder = t % 10;
      sum = sum + remainder;
      t = t / 10;
    }
 
  printf("Digit-sum of %d = %d\n", m, sum);
 
  return 0;
}