> #include<iostream>
> //#include<fstream>
> 
> using namespace std;
> 
> int main()
> {
> 	//ifstream cin("source.txt");
> 	long i,j,k,w[21][21][21]={0};
> 	
> 	for(i=0;i<21;i++)
> 		for(j=0;j<21;j++)
> 			w[0][i][j] = w[i][0][j] = w[i][j][0] = 1;
> 
> 	for(i=1;i<=20;i++)
> 		for(j=1;j<=20;j++)
> 			for(k=1;k<=20;k++)
>                 if(i<j&&j<k)
> 			        w[i][j][k]+=w[i][j][k-1]+w[i][j-1][k-1]-w[i][j-1][k];
> 					
> 				else 
>                	w[i][j][k]+=w[i-1][j][k]+w[i-1][j-1][k]+w[i-1][j][k-1]-w[i-1][j-1][k-1];
> 					  
> 	while(cin>>i>>j>>k)
> 	{
> 		if(-1==i&&-1==j&&-1==k)break;
> 	    if(i<=0||j<=0||k<=0)
> 		{
> 			cout<<"w("<<i<<", "<<j<<", "<<k<<") = "<<1<<endl;
> 			continue;
> 		}
>         if(i>20||j>20||k>20)
> 		{
> 			cout<<"w("<<i<<", "<<j<<", "<<k<<") = "<<w[20][20][20]<<endl;
> 			continue;
> 		}
> 		cout<<"w("<<i<<", "<<j<<", "<<k<<") = "<<w[i][j][k]<<endl;
> 	}
> 
> 	return 0;
> }