#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll a,b,c;
ll w(ll a,ll b,ll c){
	if(a<=0||b<=0||c<=0) return 1;
	if(a>20||b>20||c>20) return w(20,20,20);
	if(a<b&&b<c) return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
	return w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
}
int main(){
	while(cin>>a>>b>>c){
		if(a==-1&&b==-1&&c==-1) break;
		cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<w(a,b,c)<<endl;
	}
	return 0;
}