#include<iostream>
using namespace std;
long b,c,d,M=1e9+7;
long pow(long a,long b){return b?pow(a*a%M,b/2)*(b%2?a:1)%M:1;}
main()
{
	cin>>b>>c>>d;
	if(c>1)cout<<b*c%M*(pow(c,d)-1+M)%M*pow(c-1,M-2)%M<<endl;
	else cout<<b*d%M<<endl;
}