main.cpp

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#include <bits/stdc++.h>
 
using namespace std;
 
class Solution
{
public:
    int addDigits(int num)
    {
        return 1 + (num - 1) % 9;        
    }
};
 
int main()
{
    cout << Solution().addDigits(12345) << endl;
    return 0;
}