#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: huanghengyi
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/