#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y;
	cin>>x;
	if(x>0)y=x+1;
	else if(x==0)y=0;
	else y=x-1;
	cout<<y;
	return 0;
}

/**************************************************************
	Problem: 1038
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/