#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;
	if(i>a+b+c+d){
		cout<<i-(a+b+c+d);
	}else{
		cout<<(a+b+c+d)-i;
	}
	
	
}
/**************************************************************
	Problem: 1702
	User: linzihang
	Language: C++
	Result: Wrong Answer
****************************************************************/