#include <bits/stdc++.h>
using namespace std;
const int N = (int)1e5 + 5;
const int INF = (int)1e9 + 9;
const double eps = 1e-9;
const double pi = 3.1415926535897932384626433832795;
int main() {
  ios_base::sync_with_stdio(0);
  int a, b, r;
  cin >> a >> b >> r;
  r *= 2;
  if ((a / r) * (b / r) >= 1)
    cout << "First";
  else
    cout << "Second";
  return 0;
}
