#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cout.tie(0);
  cin.tie(0);
  long long i, j, k, l, m, n, o, q, r, p;
  while (cin >> k >> n >> m) {
    m *= 2;
    k = (k / m) * 2;
    n = (n / m) * 2;
    if (n > k) swap(n, k);
    if (n % 2 == 1 || n == 0)
      cout << "Second" << endl;
    else
      cout << "First" << endl;
  }
  return 0;
}
