#include <bits/stdc++.h>
using namespace std;
long long int visited[200001];
char c[1000][1000];
long long int leaf[200001], leafc;
long long int dp[200001], ind[200001], dist[200001];
vector<pair<long long int, long long int>> at_leaf(200001);
int32_t main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  long long int n, m;
  cin >> n >> m;
  long long int r;
  cin >> r;
  if (2 * r > min(n, m))
    cout << "Second" << endl;
  else
    cout << "First" << endl;
  return 0;
}
