#include<bits/stdc++.h>
#define ll long long
using namespace std;
int n,m,k,ans=0,f=0,mp[20][20];
bool check(int x,int y){
	if(mp[x-1][y]||mp[x][y-1])return false;
	return true;
}
void work(int x,int y,int k1){
//	cout<<x<<' '<<y<<' '<<k1<<endl;
	if(k1==0){
		ans++;
		return;
	}
	if((f&&x==0&&y==0)||x>=n&&y>=m)return;
	f=1;
	if(check(x,y)){
		mp[x][y]++;
		work((x+(y+1)/m)%n,(y+1)%m,k1-1);
		mp[x][y]--;
	}
	work((x+(y+1)/m)%n,(y+1)%m,k1);
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	cin>>n>>m>>k;
	work(0,0,k);
	cout<<ans+1;
	return 0;
}