tj

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,x,y;
    cin>>n>>x>>y;
    int rx=1,num=y;
    int top=1,bottom=n,left=1,right=n;
    bool fx=true;
    while(rx!=x){
        if(fx){
            if(right==y){
                num+=x-rx;
                break;
            }
        }
        else{
            if(left==y){
                num+=rx-x;
                break;
            }
        }
        if(fx){
            num+=(right-y+1)*2+bottom-rx-2;
            rx=bottom;
            right--;
            top++;
        }
        else{
            num+=(y-left+1)*2+rx-top-2;
            rx=top;
            left++;
            bottom--;
        }
        fx=!fx;
    }
    cout<<num;
	return 0;
}