#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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