#include<stdio.h>
int main()
{
	int a;
	scanf("%d",&a);
	printf("%d",a+a%10+a/10%10+a/100%10+a/1000);
	return 0;
}
/**************************************************************
	Problem: 1617
	User: admin
	Language: C
	Result: Accepted
	Time:11 ms
	Memory:1144 kb
****************************************************************/