#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
using namespace std;
typedef long long ll;
int INF = (1LL << 30) - 1;
int MOD = 1e9+7;
ll powmod(ll x,ll n){
    if(n == 0)return 1;
    ll ans = powmod(x*x%MOD,n/2);
    if(n % 2)ans = ans * x % MOD;
    return ans;
}
ll divmod(ll a,ll b){
    return ((a%MOD) * (powmod(b,MOD-2)%MOD)) % MOD;
}
main(){
    ll A,R,N;
    cin >> A >> R >> N;
    A %= MOD, R %= MOD;
    if(R == 1){
        cout << A * (N % MOD) % MOD << endl;
    }else if(R == 0){
        cout << 0 << endl;
    }else{
        cout << (A * R) % MOD * (divmod( (powmod(R,N) - 1) , R - 1)) % MOD << endl;
    }
}