text: #include <bits/stdc++.h>
  #define lli long long int
  #define endl "\n"
  using namespace std;
  
  int main()
  {
  	int n1,n2,r;
  	cin>>n1>>n2>>r;
  	int d = r*2;
  	if(d > min(n1,n2))
  		cout<<"Second";
  	else
  		cout<<"First";
  	
  
  	return 0;
  }