#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long int l, b, r;
  cin >> l >> b >> r;
  if (min(l, b) < 2 * r)
    cout << "Second" << endl;
  else
    cout << "First" << endl;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  clock_t zzzz = clock();
  long long int t;
  t = 1;
  while (t--) solve();
  fprintf(stderr, "Total Time: %.3f\n",
          (double)(clock() - zzzz) / CLOCKS_PER_SEC),
      fflush(stderr);
}
