#include<bits/stdc++.h>
using namespace std;
int a,b,c;
int w(int a,int b,int c)
{
	if(a<=0||b<=0||c<=0) return 1;
	if(a>20||b>20||c>20) return w(20,20,20);
	if(a<b||b<c) return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
	else return w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
}
int main()
{
	while(1)
	{
		cin>>a>>b>>c;
		if(a==-1&&b==-1&&c==-1) break;
		cout<<"w("<<a<<","<<b<<","<<c<<") = "<<w(a,b,c)<<endl;
	}
	return 0;
}