#include <iostream>

using namespace std;

int cw[22][22][22];

int w(int a,int b,int c)
{
    if(a <= 0 || b <= 0 || c <= 0)  return 1;
    else if(a > 20 || b > 20 || c > 20)  return w(20,20,20);
    else if(cw[a][b][c] > 0)  return     cw[a][b][c];
    else if(a < b && b < c)  return cw[a][b][c] = w(a, b, c-1) + w(a, b-1, c-1) - w(a, b-1, c) ;
    else return cw[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()
{
    int a,b,c;
    while(scanf("%d%d%d",&a,&b,&c) != EOF)
    {
        if(a == -1 && b == -1 && c == -1)   break;
        memset(cw,-1,sizeof(cw));
        printf("w(%d, %d, %d) = %d\n",a,b,c,w(a,b,c));
    }
    return 0;
}