#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 if(x<0) y=x-1;
    cout<<y;
}
/**************************************************************
	Problem: 1038
	User: wangchenyu
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/