#include<iostream>
using namespace std;
int main()
{
 int i,p,s,n,w;
 cin>>p;
 cin>>s;
 cin>>n;
 w=p;
 for(i=3;i<=n;i=i+2)
 {
    p=p+s;
    w=w+p;
 }
 cout<<p<<endl;
 cout<<w<<endl;
 return 1;
}