#include <iostream>
using namespace std;
long long m[110][110][110];
long long w(int a, int b, int c) {
    if (a > 20 || b > 20 || c > 20)
        return w(20, 20, 20);
    if (m[a][b][c] != 0)
        return m[a][b][c];
    if (a <= 0 || b <= 0 || c <= 0)
        return m[a][b][c] = 1;
    else if (a > 20 || b > 20 || c > 20)
        return m[a][b][c] = w(20, 20, 20);
    else if (a < b and b < c)
        return m[a][b][c] = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c);
    else
        return m[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() {
    while (1)
    {
        int a, b, c;
        scanf("%d%d%d", &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;
}