#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,a,b,c,d,s=0;
	cin>>x;
	a=x/1000*1;
	b=x/100%10*10;
	c=x/10%10*100;
	d=x%10*1000;
	s=a+b+c+d;
	cout<<s;	
}
/**************************************************************
	Problem: 1029
	User: fhjdghj
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/