#include<iostream>
using namespace std;

int jiyi[30][30][30] = {0};
int w(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 w(20,20,20);
	else if(jiyi[a][b][c]==0){
		if(a<b&&b<c) jiyi[a][b][c] = w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
		else jiyi[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 jiyi[a][b][c];
	}
	
}

int main(){
	long long a,b,c;
	while(1){
		cin >> a >> b >> c;
		if(a==-1&&b==-1&&c==-1){
			break;
		}
		int ans = w(a,b,c);
		printf("w(%d,%d,%d) = %d",a,b,c,ans);
	}


}