#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,i=0,j=0,h=0;
	cin>>x;
	i=x%10;
	j=x/100;
	h=i+j;
	cout<<h;
}
/**************************************************************
	Problem: 1614
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:30 ms
	Memory:2072 kb
****************************************************************/