#include<bits/stdc++.h>
using namespace std;

int a,b,c;
int l[21][21][21] = {0};
int w(int a ,int b , int c){
	if(a <= 0 || b <= 0 || c <= 0){
		return 1;
	}
	if(a > 20 || b > 20 || c > 20){
		return w(20 , 20 , 20);
	}
	if(l[a][b][c] != 0){
		return l[a][b][c];
	}
	if(a < b && b < c){
		l[a][b][c] = w(a,b,c - 1) + w(a,b - 1,c - 1) - w(a,b - 1,c);
	}
	if(a < b && b < c){
		l[a][b][c] = w(a,b,c - 1) + w(a,b - 1,c - 1) - w(a,b - 1,c);
	}else{
		l[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 l[a][b][c];
}

int main(){
	while(true){
		scanf("%d%d%d",&a,&b,&c);
		if(a == -1 && b == -1 && c == -1){
			break;
		}
		printf("w(%d, %d, %d) = %d\n",a,b,c,w(a,b,c));
	}
	return 0;
}