#include<bits/stdc++.h>
using namespace std; 
int main(){
	int x,n,g,s;
	cin>>x;
	g=x%10;
	s=x/10;
	n=g+s;
	cout<<n;
} 
/**************************************************************
	Problem: 1605
	User: chenjiahui
	Language: C++
	Result: Accepted
	Time:43 ms
	Memory:2072 kb
****************************************************************/