// P1228
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll s[25][25][25];// 记忆化 

ll w(int a, int b, int c){
	if (a <= 0 || b <= 0 || c <= 0)	return 1;
	else if (s[a][b][c] != 0)	return s[a][b][c];
	else if (a > 20 || b > 20 || c > 20)	s[a][b][c] = w(20, 20, 20);
	else if (a < b && b < c)	s[a][b][c] = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
	else	s[a][b][c] = 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 s[a][b][c];
}
int main()
{
	ll x, y, z;
	while(1)
	{
		cin >> x >> y >> z;
		if (x == -1 && y == -1 && z == -1)	break;
		if (x > 20)	x = 21;
		if (y > 20)	y = 21;
		if (z > 20) z = 21;
		cout << "w(" << x << ", " << y << ", " << z << ") = " << w(x, y, z) << endl;
	}
    return 0;
}