#include
using namespace std;
typedef long long ll;
int f(ll n)
{
int a=0,num=0;
while(n)
{
a=n%10;
n/=10;
num+=a;
}
return (num);
}
int main()
{
ll n;
while(cin>>n)
{
cout<<f(n)<<endl;
}
return 0;
}
#include
using namespace std;
typedef long long ll;
int f(ll n)
{
int a=0,num=0;
while(n)
{
a=n%10;
n/=10;
num+=a;
}
return (num);
}
int main()
{
ll n;
while(cin>>n)
{
cout<<f(n)<<endl;
}
return 0;
}