#include <bits/stdc++.h>
using namespace std;
const int maxn = 100005;
int n, m, r;
int main() {
  int i, j;
  while (scanf("%d%d%d", &n, &m, &r) != EOF) {
    int ans;
    if (2 * r > n || 2 * r > m) {
      printf("Second\n");
    } else
      printf("First\n");
  }
  return 0;
}
