#include <bits/stdc++.h>
using namespace std;
inline long long mult(long long a, long long b, long long mod) {
  if (b == 0) return 0;
  if (b % 2 == 1) return (mult(a, b - 1, mod) + a) % mod;
  return (mult(a, b / 2, mod) * 2) % mod;
}
inline long long BinPow(long long a, long long b, long long mod) {
  if (b == 0) return 1;
  if (b == 1) return a;
  if (b % 2 == 1) return (mult(BinPow(a, b - 1, mod), a, mod)) % mod;
  long long res = BinPow(a, b / 2, mod);
  return mult(res, res, mod);
}
int a, b, c;
int main() {
  cin >> a >> b >> c;
  if (c * 2 <= a && c * 2 <= b) cout << "First", exit(0);
  cout << "Second";
  return 0;
}
