#include <bits/stdc++.h>
using namespace std;
inline int read() {
  int neg = 1, num = 0;
  char c = getchar();
  for (; !isdigit(c); c = getchar())
    if (c == '-') neg = -1;
  for (; isdigit(c); c = getchar()) num = (num << 1) + (num << 3) + c - '0';
  return neg * num;
}
int a, b, r;
int main() {
  a = read();
  b = read();
  r = read();
  if (2 * r > min(a, b))
    printf("Second");
  else
    printf("First");
  return 0;
}
