#include<bits/stdc++.h>

#define ll long long
#define fornum(A,B,C) for(A=B;A<C;++A)
#define pii pair<int,int>
#define pll pair<ll,ll>

using namespace std;

/////////////////////////////////////////////////////
#define MOD (ll)(1e9+7)
ll N,P;
ll A[2020202];
ll i, j, k,ans;


int main(){
    scanf("%lld%lld", &N,&P);
    A[0] = 0;
    A[1] = 1;
    fornum(i,2,N){
        A[i] = (P * A[i - 1] + A[i - 2]) % MOD;
    }
    j = 0;
    fornum(i,0,N){
        j = (j + A[i]) % MOD;
        ans = (ans + j * A[i]) % MOD;
    }
    printf("%lld", ans);

    return 0;
}