#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,g,s,b,h;
	cin>>x;
	g=x%10;
	s=x/10%10;
	b=x/100;
	h=g+b;
	cout<<h;	
	
}

/**************************************************************
	Problem: 1614
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/