#include <iostream>
using namespace std;
class gfg {
public:
long sumDigits(int no)
{
return no == 0 ? 0 : no % 10 + sumDigits(no / 10);
}
};
// Driver code
int main(void)
{
gfg g;
cout << g.sumDigits(11111111111111111111);
return 0;
}
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