#include<iostream>
#include<vector>
#include<string>
#include<cmath>
#define rep(i,a) for(int i = 0 ; i < a ; i ++)
#define loop(i,a,b) for(int i = a ; i < b ; i ++)
using namespace std;
int main(void){
  int x,y,d;
  cin>>x>>y>>d;
  int res = 0;
  rep(i,x+1)if(i==d)res++;
  rep(i,y+1)if(i==d)res++;
  loop(i,0,x+1){
    loop(j,0,y+1){
      loop(k,i+1,x+1){
        loop(l,j+1,y+1){
          if(abs(i-k)+abs(j-l)==d){
            cout<<i<<j<<k<<l<<endl;
            res++;
          }
        }
      }
    }
  }
  cout<<res<<endl;
}