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;
const int N = 3000 + 7;
struct T {
  int a;
  int b;
  int c;
  int it;
};
bool operator<(T f, T s) {
  if (f.a != s.a) {
    return f.a < s.a;
  }
  if (f.b != s.b) {
    return f.b < s.b;
  }
  if (f.c != s.c) {
    return f.c < s.c;
  }
  return f.it < s.it;
}
bool prie(int x) {
  if (x <= 1) {
    return 0;
  } else {
    for (int i = 2; i * i <= x; i++) {
      if (x % i == 0) {
        return 0;
      }
    }
    return 1;
  }
}
vector<int> p;
map<T, unsigned int> ret;
unsigned int solve(int a, int b, int c, int it) {
  if (it == -1) {
    return 1;
  }
  vector<int> e = {a, b, c};
  sort(e.begin(), e.end());
  a = e[0];
  b = e[1];
  c = e[2];
  if (ret.count({a, b, c, it})) {
    return ret[{a, b, c, it}];
  }
  vector<int> pws = {1, p[it]};
  while (pws.back() < N) {
    pws.push_back(pws.back() * p[it]);
  }
  unsigned int sol = 0;
  for (int i = 0; i < (int)pws.size() && pws[i] <= a; i++) {
    for (int j = 0; j < (int)pws.size() && pws[j] <= b; j++) {
      for (int k = 0; k < (int)pws.size() && pws[k] <= c; k++) {
        sol +=
            solve(a / pws[i], b / pws[j], c / pws[k], it - 1) * (i + j + k + 1);
      }
    }
  }
  ret[{a, b, c, it}] = sol;
  return sol;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  for (int i = 1; i < N; i++) {
    if (prie(i)) {
      p.push_back(i);
    }
  }
  int a, b, c;
  cin >> a >> b >> c;
  cout << solve(a, b, c, (int)p.size() - 1) % 1073741824 << "\n";
}