#include<cstdio>
#include<cmath>
using namespace std;
int n;
long long a,b,c;
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(a<b&&b<c)
    {
        return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
    }
    else
    {
        return 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()
{
    while(scanf("%lld%lld%lld",&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;
}

TLE哎呀妈真香