#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,m;
    cin>>n;
    if(n>0){
    	m=n+1;
    }if(n==0){
    	m=0;
    }if(n<0){
    	m=n-1;
    }
    cout<<m;
}
/**************************************************************
	Problem: 1038
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/