#include<cstdio> using namespace std; int arr[21][21][21]; int fun(int a,int b,int c) { if(a<=0||b<=0||c<=0) return 1; if(a>20||b>20||c>20) return arr[20][20][20]; if(arr[a][b][c]!=0) return arr[a][b][c]; if(a<b && b<c) return arr[a][b][c]=fun(a,b,c-1)+fun(a,b-1,c-1)-fun(a,b-1,c); return arr[a][b][c]=fun(a-1,b,c)+fun(a-1,b-1,c)+ fun(a-1,b,c-1)-fun(a-1,b-1,c-1); } int main() { freopen("1.txt","r",stdin); int a,b,c; arr[20][20][20]=1048576; while(scanf("%d%d%d",&a,&b,&c)!=EOF) { if(a==-1 &&b==-1&&c==-1) break; printf("w(%d, %d, %d) = %d/n",a,b,c,fun(a,b,c)); } }
