func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long INF = 9999999999999999;   const double PI = acos(-1);   long long A[100];   int main() {     ios::sync_with_stdio(false);     long long a, b, c;     cin >> a >> b >> c;     A[0] = a;     A[1] = b;     for (long long i = 2; i < 50; i++) {       A[i] = A[i - 1] + A[i - 2];     }     cout << A[c];     return 0;   }   