func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int a, b;     cin >> a >> b;     int s[6] = {a, b, b - a, -a, -b, a - b};     int n;     cin >> n;     cout << (s[(n - 1) % 6] % (long long)1000000007 + (long long)1000000007) %                 (long long)1000000007          <<   n ;     return 0;   }   