#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 7;
const int N = 1e3 + 10;
int main() {
  int a, b, r;
  cin >> a >> b >> r;
  if (r * 2 > min(a, b))
    cout << "Second" << endl;
  else
    cout << "First" << endl;
  return 0;
}
