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>
int main() {
  int a, b, x, y, z;
  scanf("%d %d", &a, &b);
  if (a % b == 0) {
    x = a / b;
    if (x >= b) {
      y = x / b;
      printf("%d", a + x + y);
    } else
      printf("%d", x + a);
  } else {
    x = a / b;
    y = a - b;
    if (x + y >= b) {
      z = (x + y) / b;
      printf("%d", a + x + z);
    }
  }
  return 0;
}
