#include <bits/stdc++.h>
using namespace std;
int pf(int n) {
  int cnt;
  long long div = 1;
  for (int i = 2; i * i <= n; i++)
    if (n % i == 0) {
      cnt = 0;
      while (n % i == 0) {
        cnt++;
        n /= i;
      }
      div = (div * (cnt + 1)) % 1073741824;
    }
  if (n > 1) div = (div * 2) % 1073741824;
  return div;
}
int main() {
  ios::sync_with_stdio(false);
  int a, b, c;
  long long ans = 0;
  cin >> a >> b >> c;
  for (int i = 1; i <= a; i++)
    for (int j = 1; j <= b; j++)
      for (int k = 1; k <= c; k++) {
        ans = (ans + pf(i * j * k)) % 1073741824;
      }
  cout << ans << endl;
  return 0;
}

### Prompt

Construct a Cpp code solution to the problem outlined:

Let's denote d(n) as the number of divisors of a positive integer n. You are given three integers a, b and c. Your task is to calculate the following sum:

<image>

Find the sum modulo 1073741824 (230).

Input

The first line contains three space-separated integers a, b and c (1 ≤ a, b, c ≤ 2000).

Output

Print a single integer — the required sum modulo 1073741824 (230).

Examples

Input

2 2 2


Output

20


Input

4 4 4


Output

328


Input

10 10 10


Output

11536

Note

For the first example.

  * d(1·1·1) = d(1) = 1; 
  * d(1·1·2) = d(2) = 2; 
  * d(1·2·1) = d(2) = 2; 
  * d(1·2·2) = d(4) = 3; 
  * d(2·1·1) = d(2) = 2; 
  * d(2·1·2) = d(4) = 3; 
  * d(2·2·1) = d(4) = 3; 
  * d(2·2·2) = d(8) = 4. 



So the result is 1 + 2 + 2 + 3 + 2 + 3 + 3 + 4 = 20.

### Response

```cpp
#include <bits/stdc++.h>
using namespace std;
int pf(int n) {
  int cnt;
  long long div = 1;
  for (int i = 2; i * i <= n; i++)
    if (n % i == 0) {
      cnt = 0;
      while (n % i == 0) {
        cnt++;
        n /= i;
      }
      div = (div * (cnt + 1)) % 1073741824;
    }
  if (n > 1) div = (div * 2) % 1073741824;
  return div;
}
int main() {
  ios::sync_with_stdio(false);
  int a, b, c;
  long long ans = 0;
  cin >> a >> b >> c;
  for (int i = 1; i <= a; i++)
    for (int j = 1; j <= b; j++)
      for (int k = 1; k <= c; k++) {
        ans = (ans + pf(i * j * k)) % 1073741824;
      }
  cout << ans << endl;
  return 0;
}

```