#include <stdio.h>

#include <stdlib.h>

int main() {
    long int i, n, sum = 0;
    printf("Enter number:\n");
    scanf("%ld", & n);
    for (i = 1; i <= n; i++) {
        sum = sum + n % 10;
        n = n / 10;
    }
    printf("Sum of digits is %ld", sum);
    return 0;
}