#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,j,i;
	cin>>x;
	j=x%10;
	i=x/100;
	cout<<j+i;
}
/**************************************************************
	Problem: 1614
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/