#include <bits/stdc++.h>
using namespace std;
int f[21][21][21];
int 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);
    int k;
    if(f[a][b][c]) return f[a][b][c];
    if(a<b&&b<c) k=w(a,b,c-1)+w(a,b-1,c-1)+w(a,b-1,c);
    else k=w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
    f[a][b][c]=k;
    return k;
}
int main()
{
    long long a,b,c;
    cin>>a>>b>>c;
    while(true){
        if(a==-1&&b==-1&&c==-1) break;
        cout<<"w("<<a<<","<<b<<","<<c<<")=";
        cout<<w(a,b,c)<<endl;
        cin>>a>>b>>c;
    }
    return 0;
}