/* -*- coding: utf-8 -*-
 *
 * 2516.cc:  No.2516 Credit Creation - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n;
  double r;
  scanf("%d%lf", &n, &r);

  double sum = 0, x = 100;
  for (int i = 0; i < n; i++) {
    sum += x;
    x *= 1.0 - r;
  }

  printf("%.10lf\n", sum);

  return 0;
}