#include<iostream> using namespace std; int x[21][21][21]={0}; int w(int a,int b,int c) { if(a<=0||b<=0||c<=0) return 1; if(x[a][b][c]!=0) return x[a][b][c]; if(a<b&&b<c) { x[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c); return x[a][b][c]; } else { x[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); return x[a][b][c]; } } int main() { int a,b,c; while(cin>>a>>b>>c&&!(a==-1&&b==-1&&c==-1)) { if(a<=0||b<=0||c<=0) { printf("w(%d, %d, %d) = %d\n",a,b,c,1); continue; } if(a>20||b>20||c>20) printf("w(%d, %d, %d) = %d\n",a,b,c,w(20,20,20)); else printf("w(%d, %d, %d) = %d\n",a,b,c,w(a,b,c)); } return 0; }