#include <bits/stdc++.h>
using namespace std;
const long long MAXN = 1e5 + 5, mod = 1e9 + 7;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  long long a, b, r;
  cin >> a >> b >> r;
  if (2 * r > min(a, b)) {
    cout << "Second\n";
  } else {
    cout << "First\n";
  }
}
