#include<bits/stdc++.h>
using namespace std;
long long f[25][25][25];

long long w(long long a,long long b,long long 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(f[a][b][c]!=0) return f[a][b][c];
	else if(a<b and b<c)
		f[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1) -w(a,b-1,c);
	else
		f[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 f[a][b][c];
} 
int main(){
	long long a,b,c;
	while(cin>>a>>b>>c){
		if(a==-1&&b==-1&&c==-1)
			break;
		cout<<"w("<<a<<", "<<b<<", "<<c<<") = ";
		cout<<w(a,b,c)<<endl;
	}
	return 0;
}