#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: panjinyan
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/