#include<cstdio>
#include<iostream>
#include<string>
#include<regex>
#define VAR 23333333
using namespace std;
string s1,s2;
vector<int> m;
void pre()
{
     regex num_reg(R"(\-?\d+)");
     auto w1begin=sregex_iterator(s1.begin(),s1.end(),num_reg);
     auto w1end=sregex_iterator();
     for (sregex_iterator i=w1begin;i!=w1end;++i)
          {
          string num=i->str();
          m.push_back(stoi(num));
          }
     if (m.size()<3) m.push_back(1); //第三个参数被省略，缺省值为1

     string ch;
     ch+=s1[4]; //out loop varible

     s2=s2.substr(s2.find('('));
     regex inner_reg("["+ch+"]|\\-?\\d+");
     w1begin=sregex_iterator(s2.begin(),s2.end(),inner_reg);
     w1end=sregex_iterator();
     for (sregex_iterator i=w1begin;i!=w1end;++i)
          {
          string num=i->str();
          if (num!=ch) m.push_back(stoi(num)); //此处是外层循环变量，标记VAR
               else m.push_back(VAR);
          }
     if (m.size()<6) m.push_back(1); //第三个参数被省略，缺省值为1
}
int main()
{
     
     //freopen("input.in","r",stdin);
     //freopen("output.out","w",stdout);
     ios::sync_with_stdio(false);
     cin.tie(nullptr);
     getline(cin,s1);
     getline(cin,s1);
     getline(cin,s2);
     pre();
     int a=m[0],b=m[1],c=m[2],d=m[3],e=m[4],f=m[5],i,j;
     auto update=[](int &d,int &e,int &f,const int &i){
          if (m[3]==VAR) d=i;
          if (m[4]==VAR) e=i;
          if (m[5]==VAR) f=i;
     };
     auto calc=[](const int d,const int e,const int f) -> long long {
          if (f>0 && d>=e) return 0;
          if (f<0 && d<=e) return 0;
          long long n=(e-1-d)/f,last;
          if (d+n*f<e) last=d+n*f;
               else last=d+(n-1)*f;
          n=(last-d)/f+1;
          return (d+last)*n/2;
     };
     long long ans=0;
     if (c>0)
          {
          for (i=a;i<b;i+=c)
               {
               update(d,e,f,i);
               ans+=calc(d,e,f);
               }
          }
     else
          {
          for (i=a;i>b;i+=c)
               {
               update(d,e,f,i);
               ans+=calc(d,e,f);
               //cout<<ans<<"\n";
               }
          }
     cout<<ans<<"\n";
     return 0;
}