#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,n;
	cin>>n;
	a=n%10;
	b=n/10;
	n=a+b;
	cout<<n;
	return 0;
}
 
/**************************************************************
	Problem: 1605
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/