#include<iostream>
#include<cstdio>
#include<cstring>
#define ll long long
using namespace std;
inline ll w(ll a,ll b,ll c){
	int f[30][30][30];
	for(int i=1;i<=30;i++){
		for(int j=1;j<=30;j++){
			for(int k=1;k<=30;k++){
				f[i][j][k]=0;
			}
		}
	}
	if(a<=0||b<=0||c<=0) return 1;
	if(a>20||b>20||c>20) return w(20,20,20);
	if(a<b&&b<c){
		if(f[a][b][c]==0){
			f[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
		}
	}
	else if(f[a][b][c]==0){
		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(){
	ll a,b,c;
	while(scanf("%lld %lld %lld",&a,&b,&c)){
		if(a==-1&&b==-1&&c==-1) return 0;
		printf("w(%lld, %lld, %lld) = %lld\n",a,b,c,w(a,b,c));
	}
	return 0;
}