#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b;
	cin>>n;
	a=n/100;
	b=n%10;
	cout<<a+b;
}
/**************************************************************
	Problem: 1614
	User: baizhoudeyueguang
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/