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