#include <bits/stdc++.h>
using namespace std;
long long k[21][21][21]={0};
long long f(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 f(20,20,20);
	else if(k[a][b][c]!=0) return k[a][b][c];
	else if(a<b && b<c){
        k[a][b][c]=f(a,b,c-1)-f(a,b-1,c)+f(a,b-1,c-1);
        return k[a][b][c];
    }
    else k[a][b][c]=f(a-1,b,c)-f(a-1,b-1,c-1)+f(a-1,b-1,c)+f(a-1,b,c-1);
    return k[a][b][c];
}
int main(){
    long long a,b,c;
    cin>>a>>b>>c;
    while(a!=-1 || b!=-1 || c!=-1){
        memset(k,0,sizeof(k));
        cout<<"w("<<a<<','<<b<<','<<c<<") = "<<f(a,b,c)<<endl;
        cin>>a>>b>>c;
    }
    return 0;
}