#include "bits/stdc++.h"
#define REP(i,n,N) for(ll i=(n); i<(N); i++)
#define RREP(i,n,N) for(ll i=(N-1); i>=n; i--)
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define ALL(v) (v).begin(),(v).end()
#define p(s) cout<<(s)<<endl
#define p2(a,b) cout<<(a)<<" "<<(b)<<endl
#define v2(T) vector<vector<T>>
typedef long long ll;
using namespace std;
const ll mod = 1e9+7;

ll B,C,D;

long long fast_power(long long a, long long b) {
    long long ret = 1;
    // aが負の場合
    if (a < 0) {
        a = -a;
        if (b % 2 == 1) ret = -1;
    }
    // 累乗計算
    while (b>0) {
        if (b & 1) {
            ret *= a;
        }
        a *= a;
        a %= mod;
        ret %= mod;
        b >>= 1;
    }
    return ret;
}

int main(){
    cin>>B>>C>>D;
    B%=mod;
    C%=mod;
    if(C==1){
        p(B*(D%mod)%mod);
        return 0;
    }
    ll CD = fast_power(C,D+1);
    ll CMOD = fast_power(C-1,mod-2);
    ll ans = (B*(CD-1)%mod)*CMOD%mod;
    p((ans-B+mod)%mod);
    return 0;
}