func_code_string: #include <bits/stdc++.h>   using namespace std;   using namespace std;   int main() {     long long int k, b, n, t;     while (cin >> k >> b >> n >> t) {       long long int s = 1;       long long int cas = 0;       while (s <= t && cas < n) {         s = s * k + b;         cas++;       }       if (cas == n && s <= t)         cout << 0 << endl;       else         cout << n - cas + 1 << endl;     }     return 0;   }   