#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,i=0,c=0,a=0;
	cin>>x;
	i=x%10;
    c=x/10;
    a=i+c;
	cout<<a;
    }

/**************************************************************
	Problem: 1605
	User: huxuanchen
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/