func_code_string: #include <bits/stdc++.h>   const int N = 1e6 + 10;   const int mod = 1e9 + 7;   const int INF = 0x3f3f3f3f;   using namespace std;   long long gcd(long long a, long long b) { return b ? gcd(b, a % b) : a; }   long long lcm(long long a, long long b) { return a / gcd(a, b) * b; }   int n, m;   long long f[N];   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     f[1] = 2, f[2] = 4;     cin >> n >> m;     for (int i = 3; i <= max(n, m); ++i) f[i] = f[i - 1] % mod + f[i - 2] % mod;     cout << (f[n] + f[m] - 2) % mod <<   n ;     return 0;   }   