func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     int x, y, idx;     cin >> x >> y >> idx;     if (idx == 0)       cout << x << endl;     else if (idx == 1)       cout << y << endl;     else {       idx -= 2;       int z;       while (true) {         z = x + y;         idx--;         if (idx < 0) break;         x = y;         y = z;       }       cout << z << endl;     }   }   