#include <bits/stdc++.h>
using namespace std;
const double pi = acos(-1);
int main() {
  ios::sync_with_stdio(false);
  int m, n, k;
  while (cin >> m >> n >> k) {
    k *= 2;
    if (m >= k && n >= k) {
      cout << "First" << endl;
    } else {
      cout << "Second" << endl;
    }
  }
  return 0;
}
