#include <bits/stdc++.h>
using namespace std;
#define i64 long long
#define rep(i,s,e) for(int (i) = (s);(i) <= (e);(i)++)

i64 b,c,d;

i64 MOD = 1e9 + 7;

i64 pow(i64 x,i64 y){
    i64 res = 1;

    while(y > 0){
        if(y & 1) res = (res * x) % MOD;
        x = (x * x) % MOD;
        y >>= 1;
    }
    return res;
}
i64 inv_mod(i64 a, i64 m = MOD) {
  i64 b, x, u, q, abs_m, tmp;

  abs_m = (m < 0) ? -m : m;
  b = m;
  x = 1;
  u = 0;
  while (b > 0) {
    q = a / b;
    tmp = u;
    u = x - q * u;
    x = tmp;
    tmp = b;
    b = a - q * b;
    a = tmp;
  }

  return (x < 0) ? abs_m + x : x;
}
int main(){
    cin >> b >> c >> d;
    b %= MOD;
    c %= MOD;
    /**
     * bc + bc^2 + ... + bc^d =
     * b * (c ^ (d + 1) - 1 / (c - 1) - 1
     */
    i64 sum;
    if(c == 1) sum = d + 1;
    else sum = (((pow(c,d + 1) + MOD - 1) % MOD) * (inv_mod((c + MOD - 1) % MOD) % MOD)) % MOD;

    cout << (b * ((sum + MOD - 1) % MOD)) % MOD << endl;
}