#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b,c,d;
	cin>>n;
	a=n/1000;
	b=n/100%10*10;
	c=n/10%10*100;
	d=n%10*1000;
	cout<<a+b+c+d;
	return 0;
} 
/**************************************************************
	Problem: 1029
	User: linxichen
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/