#include <bits/stdc++.h>
using namespace std;
const long oo = int(1e9);
long a, b, r;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie();
  cout.tie();
  cin >> a >> b >> r;
  if (2 * r <= min(a, b))
    cout << "First\n";
  else
    cout << "Second\n";
}
