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

/**************************************************************
	Problem: 1614
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/