#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c,d,x;
    cin>>x;
    a=x%10;
    b=x/10%10;
    c=x/1;
    d=a+b+c;
	return 0;
}

/**************************************************************
	Problem: 1028
	User: fuyijun
	Language: C++
	Result: Wrong Answer
****************************************************************/