#include<bits/stdc++.h>
using namespace std;

int main(){
    int n,b,c;
    cin>>n;
    b=n/10;
    c=n%10;
    cout<<b+c;
    return 0;
}

#include <bits/stdc++.h> using namespace std;

//main int main() { int n; cin >> n; cout << n % 10 + n / 10 << endl;

return 0;

}