#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b,c,d,i;
	cin>>n;
	a=n%10*1000;
	b=n/10%10*100;
	c=n/100%10*10;
	d=n/1000%10*1;
	i=a+b+c+d;
	if(n>i) cout<<n-i;
	else cout<<i-n;
	
}
/**************************************************************
	Problem: 1702
	User: linzihang
	Language: C++
	Result: Wrong Answer
****************************************************************/