It is known that fleas in Berland can jump only vertically and horizontally, and the length of the jump is always equal to s centimeters. A flea has found herself at the center of some cell of the checked board of the size n × m centimeters (each cell is 1 × 1 centimeters). She can jump as she wishes for an arbitrary number of times, she can even visit a cell more than once. The only restriction is that she cannot jump out of the board.

The flea can count the amount of cells that she can reach from the starting position (x, y). Let's denote this amount by dx, y. Your task is to find the number of such starting positions (x, y), which have the maximum possible value of dx, y.

Input

The first line contains three integers n, m, s (1 ≤ n, m, s ≤ 106) — length of the board, width of the board and length of the flea's jump.

Output

Output the only integer — the number of the required starting positions of the flea.

Examples

Input

2 3 1000000


Output

6


Input

3 3 2


Output

4
#include <bits/stdc++.h>
using namespace std;
bool deb_mode = 0;
class debugger {
  vector<string> vars;

 public:
  template <typename T>
  debugger &operator,(const T v) {
    stringstream ss;
    ss << v, vars.push_back(ss.str());
    return *this;
  }
  void printall() {
    int j = 0, l = vars.size();
    for (int i = 0; i < (l - 1); i++) {
      if (i) cout << ", ";
      for (j; j < vars[l - 1].size(); j++) {
        if (vars[l - 1][j] == ',') {
          j++;
          break;
        }
        cout << vars[l - 1][j];
      }
      cout << " = " << vars[i];
    }
    vars.clear();
  }
} Dbug;
template <typename T1, typename T2>
inline ostream &operator<<(ostream &os, const pair<T1, T2> &p) {
  return os << "(" << p.first << "," << p.second << ")";
}
template <typename T>
inline ostream &operator<<(ostream &os, const vector<T> &v) {
  bool first = true;
  os << "{";
  for (unsigned int i = 0; i < v.size(); i++) {
    if (!first) os << ",";
    os << v[i];
    first = false;
  }
  return os << "}";
}
template <typename T>
inline ostream &operator<<(ostream &os, const set<T> &v) {
  bool first = true;
  os << "{";
  for (typename set<T>::const_iterator ii = v.begin(); ii != v.end(); ++ii) {
    if (!first) os << ",";
    os << *ii;
    first = false;
  }
  return os << "}";
}
template <typename T1, typename T2>
inline ostream &operator<<(ostream &os, const map<T1, T2> &v) {
  bool first = true;
  os << "{";
  for (typename map<T1, T2>::const_iterator ii = v.begin(); ii != v.end();
       ++ii) {
    if (!first) os << ",";
    os << *ii;
    first = false;
  }
  return os << "}";
}
template <typename T>
void getarray(T a[], int b, int e) {
  for (int i = b; i < e + b; i++) cin >> a[i];
}
template <typename T>
void printarray(T a[], int b, int e) {
  for (int i = b; i < e - 1 + b; i++) cout << a[i] << " ";
  if (e - 1 + b >= 0) cout << a[e - 1 + b] << endl;
}
template <typename T>
void printV(vector<T> v) {
  int sz = v.size();
  if (sz) cout << v[0];
  for (int i = 1; i < sz; i++) cout << " " << v[i];
  puts("");
}
template <typename T>
T gcd(T a, T b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
template <typename T>
T BigMod(T b, T p, T m) {
  if (p == 0) return 1;
  if (p % 2 == 0) {
    T s = BigMod(b, p / 2, m);
    return ((s % m) * (s % m)) % m;
  }
  return ((b % m) * (BigMod(b, p - 1, m) % m)) % m;
}
template <typename T>
T ModInv(T b, T m) {
  return BigMod(b, m - 2, m);
}
template <class T>
inline void read(T &x) {
  bool Minus = 0;
  char c;
  for (c = getchar(); c <= 32; c = getchar())
    ;
  if (c == '-') Minus = 1, c = getchar();
  for (x = 0; c > 32; c = getchar()) x = x * 10 + c - '0';
  if (Minus) x = -x;
}
char getc() {
  char c;
  for (c = getchar(); c <= 32; c = getchar())
    ;
  return c;
}
int CI(int &_x) { return scanf("%d", &_x); }
int CI(int &_x, int &_y) { return scanf("%d %d", &_x, &_y); }
int CI(int &_x, int &_y, int &_z) { return scanf("%d %d %d", &_x, &_y, &_z); }
int CI(int &_a, int &_b, int &_c, int &_d) {
  return scanf("%d %d %d %d", &_a, &_b, &_c, &_d);
}
template <class T>
string toString(T n) {
  ostringstream oss;
  oss << n;
  return oss.str();
}
int toInt(string s) {
  int r = 0;
  istringstream sin(s);
  sin >> r;
  return r;
}
long long int toLong(string s) {
  long long int r = 0;
  istringstream sin(s);
  sin >> r;
  return r;
}
bool isVowel(char ch) {
  ch = tolower(ch);
  if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u')
    return true;
  return false;
}
bool isUpper(char c) { return c >= 'A' && c <= 'Z'; }
bool isLower(char c) { return c >= 'a' && c <= 'z'; }
int dr8[8] = {+1, -1, +0, +0, +1, -1, -1, +1};
int dc8[8] = {+0, +0, -1, +1, +1, +1, -1, -1};
int dr4[4] = {+0, +0, +1, -1};
int dc4[4] = {-1, +1, +0, +0};
int kn8r[8] = {+1, +2, +2, +1, -1, -2, -2, -1};
int kn8c[8] = {+2, +1, -1, -2, -2, -1, +1, +2};
const double EPS = 1e-9;
const int INF = (1 << 30) - 1;
const long long int LINF = (1ll << 62) - 1;
const int mod = (int)1e9 + 7;
const int MAX = (int)1e5;
long long int f(int n, int t) {
  int rem = n % t;
  int p = n / t;
  if (n % t) p++;
  if (rem == 0) rem = t;
  return p * rem;
}
map<int, long long int> freq;
int main() {
  if (deb_mode) srand(int(time(NULL)));
  int i, j, k, l, n, m, q, a, b, c;
  int s;
  cin >> n >> m >> s;
  cout << f(n, s) * f(m, s) << "\n";
  if (deb_mode) cerr << "TIME = " << clock() << " ms" << endl;
  return 0;
}
