//Author: Puremg
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC optimize(3,"Ofast")
#include <bits/stdc++.h>
#define deg(a) cout<<#a<<'='<<a<<"\n"
#define int long long
#define all(a) a.begin(), a.end()
// #define db double
#define ldb long double
#define db ldb
using namespace std;
typedef pair<int,int> PII;
typedef long long ll;
const int mod = 0 + 7;
const int N = 1e6+10;
const db eps = 1e-12;
const db pi = acos(-1);
mt19937_64 rng(random_device{}());
void solve() {
  string s;
  getline(cin, s);
  string a;
  getline(cin, a);
  // deg(s);
  // deg(a);
  a = ' ' + a;
  int l = 0, r = 0, z = 0;
  char chh = a[5];
  string ch = "";
  ch += chh;
  string ll, rr, zz;
  int idx = 16;
  while (a[idx] != ',') idx ++;
  ll = a.substr(16, idx - 16);
  idx ++;
  // deg(a[idx]);
  while (a[idx] != ',' and a[idx] != ')') {
    rr += a[idx];
    idx ++;
  }
  // deg(ll);
  // deg(rr);
  // return ;
  if (a[idx] == ')') {
    zz = "1";
  } else {
    idx ++;
    while (a[idx] != ',' and a[idx] != ')') {
      zz += a[idx];
      idx ++;
    }    
  }
  // cout << ll << ' ' << rr << ' ' << zz << '\n';
  l = stoll(ll);
  r = stoll(rr);
  z = stoll(zz);
  getline(cin, a);
  a = ' ' + a;
  ll = "", rr = "", zz = "";
  idx = 16;
  while (a[idx] != ',') idx ++;
  ll = a.substr(16, idx - 16);
  idx ++;
  while (a[idx] != ',' and a[idx] != ')') {
    rr += a[idx];
    idx ++;
  }
  if (a[idx] == ')') {
    zz = "1";
  } else {
    idx ++;
    while (a[idx] != ',' and a[idx] != ')') {
      zz += a[idx];
      idx ++;
    }    
  }
  // cout << ll << ' ' << rr << ' ' << zz << '\n';
  auto get = [&](int shou, int cha, int r) -> int {
    if (shou == r) return 0;
    if (cha > 0) if(shou > r) return 0;
    if (cha < 0) if (shou < r) return 0;
    int n;
    // deg(shou);
    if (cha > 0)
    // deg(r - 1 - l);
    // deg(cha);
    // deg((r - 1 - l) / cha);
      n = max(0ll,(r - 1 - shou) / cha) + 1;
    else
      n = max(0ll,(r + 1 - shou) / cha) + 1;
    
    // deg(n);
    return n * (shou + shou + (n - 1) * cha) / 2;
  };
  // cout << ll << ' ' << rr << ' ' << zz << '\n';
  // cout << ch << '\n';
  // return ;
  if (ll == ch and rr == ch and zz == ch) {
    cout << 0 << '\n';
  } else if(ll == ch and rr == ch) {
    cout << 0 << '\n';
  }
   else if (ll == ch and zz == ch) {
    int ans = 0;
    int r2 = stoll(rr);
    if (z > 0)
      for (int i = l; i < r; i += z) {
        ans += get(i, i, r2);
      }
    else
      for (int i = l; i > r; i += z) {
        ans += get(i, i, r2);
      }
    cout << ans << '\n';
  } else if (rr == ch and zz == ch) {
    int ans = 0;
    int l2 = stoll(ll);
    if (z > 0)
      for (int i = l; i < r; i += z) {
        ans += get(l2, i, i);
      }
    else
      for (int i = l; i > r; i += z) {
        ans += get(l2, i, i);
      }
    cout << ans << '\n';
  } else if (ll == ch) {
    // cout << "cnm\n";
    // return ;
    int ans = 0;
    int r2 = stoll(rr);
    int z2 = stoll(zz);
    if (z < 0) {
      for (int i = l; i > r; i += z) {
        // cout << i << ' ' << z2 << ' ' << r2 << '\n';
        ans += get(i, z2, r2);
      }
    } else {
      for (int i = l; i < r; i += z) {
        // cout << i << ' ' << z2 << ' ' << r2 << '\n';
        ans += get(i, z2, r2);
      }
    }
    cout << ans << '\n';
  } else if (rr == ch) {
    int ans = 0;
    int l2 = stoll(ll);
    int z2 = stoll(zz);
    if (z > 0)
      for (int i = l; i < r; i += z) {
        ans += get(l2, z2, i);
      }
    else
      for (int i = l; i > r; i += z) {
        ans += get(l2, z2, i);
      }
    cout << ans << '\n';    
  } else if (zz == ch) {
    int ans = 0;
    int l2 = stoll(ll);
    int r2 = stoll(rr);
    if (z > 0)
      for (int i = l; i < r; i += z) {
        ans += get(l2, i, r2);
      }
    else
      for (int i = l; i > r; i += z) {
        ans += get(l2, i, r2);
      }
    cout << ans << '\n'; 
  } else {
    // cout << "nmsl\n";
    // deg(ch);
    // deg(l);
    // deg(r);
    // deg(z);
    int ans = 0;
    int l2 = stoll(ll);
    int r2 = stoll(rr);
    int z2 = stoll(zz);
    // deg(l2);
    // deg(r2);
    // deg(z2);
    if (z > 0)
      for (int i = l; i < r; i += z) {
        ans += get(l2, z2, r2);
      }
    else
      for (int i = l; i > r; i += z) {
        ans += get(l2, z2, r2);
      }    
    cout << ans << '\n';     
  }
}
// ans=0
// for a in range(1,3):
// for b in range(5,1,-2):

// ans=0
// for q in range(100,50,-1):
// for i in range(q,77,20):

// ans=0
// for q in range(100,50,-1):
signed main()
{
 // auto start_time = std::chrono::high_resolution_clock::now();
 // freopen("in.txt", "r", stdin);
 // freopen("out.txt", "w", stdout);
  cin.tie(nullptr)->sync_with_stdio(false);
  cout << fixed << setprecision(15);
  int T = 1;
  // cin >> T;
  while (T--) solve();
  // auto end_time = std::chrono::high_resolution_clock::now();
  // auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(end_time - start_time);
  // std::cout << "程序运行时间：" << duration.count() << "毫秒" << std::endl;
  return 0;
}