#include<bits/stdc++.h>
#define ll long long
using namespace std;
int w(ll a,ll b,ll 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(a<b&&b<c) return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
	else 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);
}
const ll N=1e5+5;
ll a[N],b[N],c[N];
int main(){
	ll d=0;
	for(ll i=1;;i++) {
		cin>>a[i]>>b[i]>>c[i];
		d++;
		if(a[i]==-1&&b[i]==-1&&c[i]==-1) break;
	}
	for(ll i=1;i<d;i++){
		cout<<"w("<<a[i]<<", "<<b[i]<<", "<<c[i]<<") = "<<w(a[i],b[i],c[i])<<endl;
	}
	
	
	return 0;
}