#include <iostream>
#include <cstdio>
using namespace std;

const int MAXN = 1005;
long long x, y, z;
long long f[MAXN][MAXN][MAXN];

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