func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int power(long long int x, unsigned long long int y) {     long long int res = 1;     while (y > 0) {       if (y & 1) {         res = res * x;       }       y = y >> 1;       x = x * x;     }     return res;   }   long long int powermod(long long int x, unsigned long long int y,                          long long int p) {     long long int res = 1;     x = x % p;     while (y > 0) {       if (y & 1) {         res = (res * x) % p;       }       y = y >> 1;       x = (x * x) % p;     }     return res;   }   int32_t main() {     long long int n, m;     cin >> n >> m;     vector<long long int> f(m + n);     f[0] = 1, f[1] = 1;     for (long long int i = (long long int)(2); i < (long long int)(m + n); i++) {       f[i] = f[i - 1] + f[i - 2];       f[i] %= 1000000007;     }     long long int ans = 2 * f[n];     ans %= 1000000007;     ans += 2 * f[m];     ans %= 1000000007;     ans -= 2;     if (ans < 0) ans += 1000000007;     cout << ans <<   n ;     return 0;   }   