#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll f[25][25][25],a,b,c;
ll 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(f[a][b][c]!=0)return w(20,20,20);
	else if(a<b&&b<c) f[a][b][c]=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()
{
	while(scanf("%lld%lld%lld",&a,&b,&c)==3)
	{
		memset(f,0,sizeof(f));
		if(a==-1&&b==-1&&c==-1)break;
		printf("w(%lld, %lld, %lld) = %lld\n",a,b,c,w(a,b,c));
	}
	return 0;
}