#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, r, row = 0, column = 0, z = 0;
  double x;
  cin >> a >> b >> r;
  x = double(a) / 2;
  x -= r;
  if (x >= 0) {
    z++;
  }
  while (true) {
    x = x / 2;
    x -= r;
    if (x >= 0) {
      row += 2;
    } else {
      break;
    }
  }
  row = row * 2 + z;
  z = 0;
  x = double(b) / 2;
  x -= r;
  if (x >= 0) {
    z++;
  }
  while (true) {
    x = x / 2;
    x -= r;
    if (x >= 0) {
      column += 2;
    } else {
      break;
    }
  }
  column = column * 2 + z;
  if ((row * column) % 2) {
    cout << "First";
  } else {
    cout << "Second";
  }
  return 0;
}
