#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

static const ll MOD = 1000000007;

ll A[2000005];
ll B[2000005];

int main(){
  ll N, p;
  cin >> N >> p;

  A[1] = 0; B[1] = 0;
  A[2] = 1; B[2] = 1;
  REP(i,3,N+1){
    A[i] = ((p * A[i-1])%MOD) + A[i-2];
    A[i] %= MOD;
    B[i] = B[i-1] + A[i];
    B[i] %= MOD;
  }

  ll ret = 0;
  REP(i,1,N+1){
    ret += (A[i] * B[i])%MOD;
    ret %= MOD;
  }

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