#include <bits/stdc++.h>
using namespace std;
int main() {
	int n,h;
	float a,b;
	cin>>n;
	a=n/10;
	b=n%10;
	h=a+b;
	cout<<h;
    return 0;
}
/**************************************************************
	Problem: 1605
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/