#include <bits/stdc++.h>
int main() {
  int x, y, r, u, b, i, j;
  bool p1 = 0, p2 = 0;
  scanf("%d%d%d", &x, &y, &r);
  if (x > y) {
    u = x;
    b = y;
  } else {
    u = y;
    b = x;
  }
  if (b < r * 2)
    printf("Second");
  else
    printf("First");
  return 0;
}
