#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,a,b,c,d;
	cin>>i;
	a=i%10*1000;
	b=i/10%10*100;
	c=i/100%10*10;
	d=i/1000%10*1;
	cout<<abs((a+b+c+d)-i);
}

/**************************************************************
	Problem: 1702
	User: baizhoudeyueguang
	Language: C++
	Result: Wrong Answer
****************************************************************/