#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: 1043
	User: wangyousi
	Language: C++
	Result: Wrong Answer
****************************************************************/