#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ull = unsigned long long;
using vll = vector<ll>;
using vi = vector<int>;
using vb = vector<bool>;
using vs = vector<string>;
using pll = pair<ll, ll>;
using pii = pair<int, int>;
using vpii = vector<pii>;
using vpll = vector<pll>;
const ll LINF = 1ll << 55;
const ll INF = 0x3f3f3f3f;
const ll MOD = 1e9 + 7;
const int MAXN = 1e5 + 10;
const ll dx[] = {1, 0, -1, 0};
const ll dy[] = {0, 1, 0, -1};

/// cin/cout overloading
template <typename T>
ostream &operator<<(ostream &out, const vector<T> &vec) {
  for (auto it = vec.begin(); it != vec.end(); ++it) {
    out << *it << " ";
  }
  return out;
}

template <typename T>
ostream &operator<<(ostream &out, const pair<T, T> &P) {
  out << P.first << " " << P.second;
  return out;
}

template <typename T>
istream &operator>>(istream &in, vector<T> &vec) {
  for (auto it = vec.begin(); it != vec.end(); ++it) {
    in >> *it;
  }
  return in;
}

template <typename T>
istream &operator>>(istream &in, pair<T, T> &P) {
  in >> P.first >> P.second;
  return in;
}

#define error(args...)                       \
  {                                          \
    string _s = #args;                       \
    replace(_s.begin(), _s.end(), ',', ' '); \
    stringstream _ss(_s);                    \
    istream_iterator<string> _it(_ss);       \
    err(_it, args);                          \
    cerr << endl;                            \
  }

void err(istream_iterator<string>) {}
template <typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
  cerr << *it << " = " << a << ", ";
  err(++it, args...);
}

#define rep(i, begin, end)                            \
  for (__typeof(end) i = (begin) - ((begin) > (end)); \
       i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define all(x) (x).begin(), (x).end()
#define coutp(x, y) cout << (x) << " " << (y) << endl
#define coutn(x) cout << (x) << endl
#define coutd(x) cout << setprecision(10) << (x) << endl

int argmax(const vi &A, int start, int end) {
  int res = 0;
  int max = 0;
  rep(i, start, end) {
    if (A[i] > max) {
      max = A[i];
      res = i;
    }
  }
  return res;
}

/// main函数
int main() {
  ll N, C;
  cin >> N >> C;
  vpll pay;
  ll ai, bi, ci;
  rep(i, 0, N) {
    cin >> ai >> bi >> ci;
    pay.emplace_back(ai - 1, ci);
    pay.emplace_back(bi, -ci);
  }
  sort(pay.begin(), pay.end());
  ll ans = 0, p = 0, curr = 0;
  for (auto &[v, c] : pay) {
    ans += min(C, curr) * (v - p);
    p = v;
    curr += c;
  }
  coutn(ans);
  return 0;
}

#include <bits/stdc++.h>
 
using namespace std;
#define all(x) (x).begin(),(x).end()
#define rep(i, n) for (int i = 0; i < (n); i++)
#define endl "\n"
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) {os << "["; for (const auto &v : vec) {os << v << ","; } os << "]"; return os;}
template <typename T, typename U> ostream &operator<<(ostream &os, const pair<T, U> &p) {os << "(" << p.first << ", " << p.second << ")"; return os;}

void solve() {
    int X, Y, Z;
    cin >> X >> Y >> Z;

    // t / Z < Y / X 
    // t * X < Y * Z
    if ((Y * Z) % X == 0) {
        cout << Y * Z / X - 1 << endl;
    } else {
        cout << Y * Z / X << endl;
    }

}

int main() {
    #ifdef LOCAL_ENV
    cin.exceptions(ios::failbit);
    #endif
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout.setf(ios::fixed);
    cout.precision(16);
    
    solve();
}