#include <bits/stdc++.h>
using namespace std;
int memo[21][21][21];
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 (memo[a][b][c] != -1)
return memo[a][b][c];
if (a < b && b < c)
return memo[a][b][c] = w(a, b, c-1) + w(a, b-1, c-1) - w(a, b-1, c);
else
return memo[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);
}
int main() {
memset(memo, -1, sizeof(memo));
int a, b, c;
while (cin >> a >> b >> c) {
if (a == -1 && b == -1 && c == -1)
break;
cout << "w(" << a << ", " << b << ", " << c << ") = " << w(a, b, c) << endl;
}
return 0;
}