#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  c *= 2;
  int d = a / c;
  if (d > 1) d -= 1;
  int e = b / c;
  if (e > 1) e -= 1;
  int res = d * e;
  if (!res % 2)
    cout << "Second\n";
  else
    cout << "First\n";
}
