#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)
#define FOR(i,b,e) for (int i=(int)(b); i<(int)(e); i++)
#define ALL(x) (x).begin(), (x).end()

const double PI = acos(-1);
const long long MOD = 1e9 + 7;

long long modpow(long long x, long long p, long long mod) {
  long long ret = 1;
  while (p) {
    if (p & 1)
      ret = ret * x % mod;
    x = x * x % mod;
    p >>= 1;
  }
  return ret;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n, p;
  cin >> n >> p;
  vector<long long> f(n), g(n);

  f[1] = g[1] = 1;
  for (int i = 2; i < n; i++) {
    f[i] = (p * f[i-1] % MOD + f[i-2]) % MOD;
    g[i] = f[i] * f[i] % MOD;
  }

  long long fsum = 0, gsum = 0;
  for (int i = 0; i < n; i++) {
    fsum = (fsum + f[i]) % MOD;
    gsum = (gsum + g[i]) % MOD;
  }

  long long ret = fsum * fsum % MOD;
  ret = (ret - gsum + MOD) % MOD;
  ret = ret * modpow(2, MOD-2, MOD) % MOD;
  ret = (ret + gsum) % MOD;

  cout << ret << endl;
  
  return 0;
}