#include<iostream>
#include<iomanip>
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<<endl;
	
}
	

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