#include<iostream>
using namespace std;
int l[22][22][22]={0};//记忆化，将中间过程记忆化，可节省多余计算
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(l[a][b][c]!=0)return l[a][b][c];//先判断>20，后判断是否记忆化
	if (a < b && b < c) l[a][b][c]= w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
	else l[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 l[a][b][c];
}
int main() {
	int a, b, c;
	while (true) {
		cin >> a >> b >> c;
		if (a == -1 && b == -1 && c == -1)break;
		printf("w(%d,%d,%d)=%d\n", a, b, c, w(a, b, c));
	}
	return 0;
}