#include <bits/stdc++.h>
using namespace std;
const int INF = 2147483647;
const int MAXN = 20005;
int T, N, M;
double a, b, r;
int main() {
  cin >> a >> b >> r;
  if (a / 2 >= r && b / 2 >= r) {
    printf("First\n");
  } else
    printf("Second\n");
  return 0;
}
