#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1000000000 + 7;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long n, m, k;
  cin >> n >> m >> k;
  if (2 * k > min(n, m))
    cout << "Second" << endl;
  else
    cout << "First" << endl;
  return 0;
}
