#include<iostream>
#include<cmath>
using namespace std;
int g[25][25][25];
int h[25][25][25];
int w(long long int a,long long int b,long long int c){
	if(a<1||b<1||c<1){
		return 1;
	}
	if(a>20||b>20||c>20){
		return w(20,20,20);
	}
	if(h[a][b][c]!=0){
		return g[a][b][c];
	}
	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);
	if(a>-1&&a<21&&b>-1&&c>-1&&b<21&&c<21){
		g[a][b][c]=w(a,b,c);
		h[a][b][c]=114514;
	}
}
int main(){
	long long int a,b,c;
	while(1){
		cin>>a>>b>>c;
		if(a==-1&&b==-1&&c==-1){
			break;
		}
		cout<<"w("<<a<<","<<b<<","<<c<<")="<<sqrt(w(a,b,c))<<endl;
	}
	return 0;
}