#include <bits/stdc++.h>
using namespace std;
int jyh[25][25][25];
long long w(long long a,long long b,long long c){
	if(a<=0||b<=0||c<=0){
		return 1;
	}
	if(a>20||b>20||c>20){
		return w(20,20,20);
	}
	if(jyh[a][b][c]!=0){
		return jyh[a][b][c];
	}
    if(a<b&&b<c){
		return jyh[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
	}
	else{
		return jyh[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);
	}
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	long long a,b,c;
	while(1){
		memset(jyh,0,sizeof(jyh));
		cin>>a>>b>>c;
		if(a==-1&&b==-1&&c==-1){
			break;
		}
		printf("w(%lld, %lld, %lld) = %d\n",a,b,c,w(a,b,c));
	}
	return 0;
}