#include<iostream>
#include<cstdio>
using namespace std;

int w[25][25][25];

int main()
{
	int i,j,k,a,b,c;
	cin>>a>>b>>c;
	for(i=0;i<=20;i++)
	{
		for(j=0;j<=20;j++)
		{
			for(k=0;k<=20;k++)
			{
				if(i==0||j==0||k==0)
					w[i][j][k]=1;
				else if(i<j&&j<k)
					w[i][j][k]=w[i][j][k-1]+w[i][j-1][k-1]-w[i][j-1][k];
				else
					w[i][j][k]=w[i-1][j][k]+w[i-1][j-1][k]+w[i-1][j][k-1]-w[i-1][j-1][k-1];
			}
		}
	}
	while(a!=-1||b!=-1||c!=-1)
	{
		if(a>20||b>20||c>20)
			printf("w(%d, %d, %d) = %d\n",a,b,c,w[20][20][20]);
		else if(a<=0||b<=0||c<=0)
			printf("w(%d, %d, %d) = 1\n",a,b,c);
		else
    		printf("w(%d, %d, %d) = %d\n",a,b,c,w[a][b][c]);
		cin>>a>>b>>c;
	}
	return 0;
}

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