#include<stdio.h>
int main(){
	int x,y;
	scanf("%d",&x);
	if(x>0){
		y=x+1;
	}else if(x==0){
		y=0;
	}else{
		y=x-1;
	}
	printf("%d",y);	
	return 0;
}
/**************************************************************
	Problem: 1038
	User: admin
	Language: C
	Result: Accepted
	Time:10 ms
	Memory:1144 kb
****************************************************************/