#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll sw[25][25][25];
ll f(ll a,ll b,ll c){
	if(a<=0||b<=0||c<=0)
		return 1;
	if(a>20||b>20||c>20)
		return f(20,20,20);
	if(sw[a][b][c]!=0)
		return sw[a][b][c];
	if(a<b&&b>c)
		return sw[a][b][c]=f(a,b,c-1)+f(a,b-1,c-1)-f(a,b-1,c);
	return sw[a][b][c]=f(a-1,b,c)+f(a-1,b-1,c)+f(a-1,b,c-1)-f(a-1,b-1,c-1);
}
int main(){
	while(1){
		ll a,b,c;
		cin>>a>>b>>c;
		if(a==-1&&b==-1&&c==-1)
			break;
		else
			printf("w(%lld,%lld,%lld) = %lld\n",a,b,c,f(a,b,c));
	}
	return 0;
}