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