#include <stdio.h>
int main()
{
int n,i=0,s=0;
scanf("%d",&n);
for(;n!=0;)
{
i=n%10;
n=n/10;
s+=i;
}
printf("%d",s);
return 0;
}
#include <stdio.h>
int main()
{
int n,i=0,s=0;
scanf("%d",&n);
for(;n!=0;)
{
i=n%10;
n=n/10;
s+=i;
}
printf("%d",s);
return 0;
}