Problem: 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:

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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.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int main() {
  unsigned int a, b, c;
  cin >> a >> b >> c;
  unsigned int nd[1000004] = {}, ans = 0;
  for (unsigned int i = 1; i <= a; i++) {
    for (unsigned int j = 1; j <= b; j++) {
      for (unsigned int k = 1; k <= c; k++) {
        unsigned int d = i * j * k;
        unsigned int s, cnt = 0;
        if (nd[d] == 0) {
          for (s = 1; s * s < d; s++)
            if (d % s == 0) cnt += 2;
          if (s * s == d) cnt++;
          nd[d] = cnt;
          ans += cnt;
        } else
          ans += nd[d];
      }
    }
  }
  cout << ans << "\n";
}