#include <bits/stdc++.h>
#define ll long long
using namespace std;
long long arr[30][30][30];
long long fun(long long a,long long b,long long c){
	if(a<=0 || b<=0 || c<=0){
		return 1;
	}
	else if(a>20 || b>20 || c>20){
		return fun(20,20,20);
	}
	if(arr[a][b][c]!=0){
		return arr[a][b][c];
	}
	if(a<b && b<c){
		return arr[a][b][c]=fun(a,b,c-1)+fun(a,b-1,c-1)+fun(a,b-1,c);
	}else{
		return arr[a][b][c]=fun(a-1,b,c)+fun(a-1,b-1,c)+fun(a-1,b,c-1)-fun(a-1,b-1,c-1);
	}
}
int main(){
	long long a,b,c;
	while(a!=-1 && b!=-1 && c!=-1){
		cin>>a>>b>>c;
		if(a==-1 && b==-1 && c==-1){
			return 0;
		}
		printf("w(%d, %d, %d) = %d\n",a,b,c,fun(a,b,c));
	}
    return 0;
}