#include <bits/stdc++.h>
using namespace std;
int a, b, ak, bk, k, r, rr;
int main() {
  cin >> a >> b >> r;
  rr = 2 * r;
  if (a % 2 == 1)
    ak = (a - (rr + 1)) / 2;
  else
    ak = (a - rr) / 2;
  if (b % 2 == 1)
    bk = (b - (rr + 1)) / 2;
  else
    bk = (b - rr) / 2;
  k = (a / rr) * (bk / rr) * 2 + (ak / rr) * (bk / rr) * 2;
  if (a < rr || b < rr)
    cout << "Second";
  else if (k % 2 == 0)
    cout << "First";
  else
    cout << "Second";
  return 0;
}
