$\Huge \textbf{\textmd{请勿抄袭}}$

#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,tmx,tmy;
void f(){
    if(tmx==n||tmy==n||tmx==1||tmy==1){
        return;
    }
    tmx--,tmy--;
    n=n-2;
    f();
}
signed main(){
    scanf("%lld%lld%lld",&n,&tmx,&tmy);
    int n2=n;
    f();
    int jc=n2*n2-n*n;
    if(tmx==1&&tmy==1) printf("%lld",n2*n2);
    if(tmx==1&&tmy!=n) printf("%lld",jc+tmy);
    if(tmy==n&&tmx!=n) printf("%lld",jc+n+tmx-1);
    if(tmx==n&&tmy!=1) printf("%lld",jc+3*n-tmy-1);
    if(tmy==1&&tmx!=1) printf("%lld",jc+4*n-tmx-2);
    return 0;
}