#include <bits/stdc++.h>
using namespace std;
int a, b, r;
int read() {
  char c = getchar();
  int ans = 0;
  while (c < '0' || c > '9') c = getchar();
  while (c >= '0' && c <= '9')
    ans = (ans << 1) + (ans << 3) + (c ^ 48), c = getchar();
  return ans;
}
int main() {
  a = read(), b = read(), r = read();
  printf("%s", (a >= r + r && b >= r + r) ? "First" : "Second");
  return 0;
}
