func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = 1e9 + 7;   int fib(int n) {     int b = 1;     int c = 1;     while (n--) {       c = (c + b) % MOD;       swap(b, c);     }     return c;   }   int main() {     int n, m;     cin >> n >> m;     int a = fib(n);     int b = fib(m);     cout << (a + b - 1) % MOD * 2 % MOD << endl;     return 0;   }   