#include <stdio.h>

int main(void) {
	// your code goes here
	int x,a,b,c,d,e,sum;
	scanf("%d\n",&x);
	a=x/10000;
	b=(x-a*10000)/1000;
	c=(x-a*10000-b*1000)/100;
	d=(x-a*10000-b*1000-c*100)/10;
	e=x%10;
	sum=a+b+c+d+e;
	printf("sum=%d\n",sum);
	return 0;
}