#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=x-1;
	}
	else {
		y=x;
	}
	printf("%d",y);
}

/**************************************************************
	Problem: 1038
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/