#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
const long long LINF = 0x3f3f3f3f3f3f3f3f;
const int MOD = (int)1e9 + 7;
const int N = (int)1e6 + 7;
int a, b, r;
void Init() {}
int Solve() { return puts(2 * r <= min(a, b) ? "First" : "Second"); }
int main() {
  while (~scanf("%d%d%d", &a, &b, &r)) {
    Init();
    Solve();
  }
  return 0;
}
