1 #include<cstdio>
 2 #include<cmath>
 3 #include<cstring>
 4 #include<stdlib.h>
 5 #include<algorithm>
 6 using namespace std;
 7 int w[100][100][100];
 8 int f(int a,int b,int c)
 9 {
10     if(a<=0||b<=0||c<=0)
11         return 1;
12     else if(a>20||b>20||c>20)
13         return f(20,20,20);
14     else if(a<b&&b<c)
15     {
16         if(!w[a][b][c])
17             w[a][b][c]=f(a,b,c-1)+f(a,b-1,c-1)-f(a,b-1,c);
18         return w[a][b][c];
19     }
20     else
21     {
22         if(!w[a][b][c])
23             w[a][b][c]=f(a-1,b,c)+f(a-1,b-1,c)+f(a-1,b,c-1)-f(a-1,b-1,c-1);
24         return w[a][b][c];
25     }
26 }
27 int main()
28 {
29     int a,b,c;
30     memset(w,0,sizeof(w));
31     while(scanf("%d %d %d",&a,&b,&c)!=EOF)
32     {
33         if(a==-1&&b==-1&&c==-1)
34             break;
35         printf("w(%d, %d, %d) = %d\n",a,b,c,f(a,b,c));
36     }
37     return 0;
38 }