#include <bits/stdc++.h>
using namespace std;
long long f[30][30][30];
long long w(long long a,long long b,long long c){
	if(a<=0 || b<=0 || c<=0)return 1;
	
	if(a>20 || b>20 || c>20)return w(20,20,20);
	
	if(f[a][b][c]!=0) return f[a][b][c];
	
	if(a<b && 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)return 0;
		cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<< w(a,b,c)<<endl;
	
		
	}
	return 0;
}