#include<iostream>//  cheng da cai zi 11. 18  解锁问题

 using namespace std;

 #define f 360

 int main()

 {

     int b;

     int a1;

     int a2;

     int a3;

     int sum=;

     int sum1=*;

     while()

     {

     sum=;

     sum1=*;

     cin>>b;

     cin>>a1;

     cin>>a2;

     cin>>a3;

     if(b==&&a1==&&a2==&&a3==)

         break;

     ///////////////顺时针

         if(b>=&&b<a1)

         sum+=-a1*+b*;

     else if(b>a1&&b<)

         sum+=b*-a1*;

     sum1+=sum;

     //cout<<sum<<"--------------"<<endl;

     ////////////////逆时针

     sum=;

     if(a1>=&&a1<a2)

         sum+=a2*-a1*;

     else if(a1>a2&&a1<)

         sum+=-a1*+a2*;

     sum1+=sum;

         //cout<<sum<<"--------------"<<endl;

     ///////////////////顺时针

     sum=;

     if(a2>=&&a2<a3)

         sum+=-a3*+a2*;

     else if(a2>a3&&a2<)

         sum+=(a2-a3)*;

     sum1+=sum;

         //cout<<sum<<"--------------"<<endl;

     cout<<sum1<<endl;

     }

     return ;

 }