#include <math.h>
#include <iostream.h>
int w(int a,int b,int 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 && c==b)
        return (int)pow(2,a);
    else if((a<=b && a<=c) || (a<=c && b<=c) || (b>=a && b>=c))
        return (int)pow(2,a);
    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()
{
    int a,b,c;
    while(cin>>a>>b>>c)
    {
        if(a==-1 && b==-1 && c==-1) return 0;
        cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<w(a,b,c)<<endl;
    }
}

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