func_code_string: #include <bits/stdc++.h>   #pragma optimization_level 3   #pragma GCC optimize( Ofast )   #pragma GCC target( avx,avx2,fma )   #pragma GCC optimization( unroll-loops )   using namespace std;   const long long N = 1e6 + 5;   const long long mod = 1e+9 + 7;   const long long INF = 0x7f7f7f7f7f7f7f7f;   const int INFi = 0x7f7f7f7f;   long long n, k;   long long ch(long long first) {     long long ans = first;     while (first) {       first /= k;       ans += first;     }     return (ans >= n);   }   void bs() {     long long l = 1;     long long r = 1e9;     while (l <= r) {       long long mid = (l + r) / 2;       if (ch(mid))         r = mid - 1;       else         l = mid + 1;     }     cout << (r + 1) << endl;   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     cout << fixed;     cout << setprecision(10);     ;     cin >> n >> k;     bs();   }   