#include <bits/stdc++.h>
using namespace std;
long long int mod = 1e9 + 7;
long long int inf = 1e18;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int t;
  t = 1;
  while (t--) {
    long long int a, b, r;
    cin >> a >> b >> r;
    if (2 * r <= min(a, b))
      cout << "First"
           << "\n";
    else
      cout << "Second"
           << "\n";
  }
  return 0;
}
