C :

#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;
}

C++ :

#include<iostream>
#include<iomanip>
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<<endl;
	
}
	

Python :

x=int(input())
if x>0:
    y=x+1
elif x==0:
    y=0
elif x<0:
    y=x-1
print(y)