#include <bits/stdc++.h>
using namespace std;

const int64_t MOD = 1e9+7;
void add(int64_t& a, int64_t b){
    a = (a+b) % MOD;
}
void mul(int64_t& a, int64_t b){
    a = a*b % MOD;
}

int64_t extgcd(int64_t a, int64_t b, int64_t& x, int64_t& y){
    int64_t d = a;
    if(b != 0){
        d = extgcd(b, a%b, y, x);
        y -= (a/b) * x;
    }else{
        x = 1; y = 0;
    }
    return d;
}

int64_t inv_mod(int64_t a){
    int64_t x, y;
    extgcd(a, MOD, x, y);
    return (MOD + x%MOD) % MOD;
}

int main(){
    int N, P;
    cin >> N >> P;
    vector<int64_t> A(N);
    A[1] = 1;
    for(int i=2; i<N; i++) A[i] = (P*A[i-1] + A[i-2]) % MOD;

    int64_t S = 0, ans = 0;
    for(int64_t a : A){
        add(S, a);
        add(ans, a*a);
    }
    add(ans, S*S);
    mul(ans, inv_mod(2));
    cout << ans << endl;
    return 0;
}