5 3
 1000 3
 777 17
 4 3
 2 2
 100 4
 10 4
 999 2
 6 4
 1 2
 17 3
 1 4
 26 8
 91 5
 1 3
 1000 2
 20 3
 9 4
 123 5
 1000 1000
 3 2
 3 3
 80 970
 1000 4
 1 1000

7
 1499
 825
 5
 3
 133
 13
 1997
 7
 1
 25
 1
 29
 113
 1
 1999
 29
 11
 153
 1001
 5
 4
 80
 1333
 1

#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, n[20] = {0}, count = 0;
  cin >> a >> b;
  if (a >= 1 && a <= 1000 && b >= 2 && b <= 1000) n[19] = a;
  for (int i = 18; i >= 0; i--) {
    n[i] = n[i + 1] / b;
  }
  for (int i = 0; i <= 19; i++) {
    count += n[i];
  }
  cout << count << endl;
  return 0;
}
