#include <stdio.h>

int main () {
  int n = 0;
  double r = 0.0;
  
  int res = 0;
  
  double ans = 1.0;
  
  res = scanf("%d", &n);
  res = scanf("%lf", &r);
  
  for (int i = 0; i < n; i++) {
    ans *= 1.0-r;
  }
  
  ans = 1.0-ans;
  ans *= 100.0;
  ans /= r;
  
  printf("%.16lf\n", ans);
  return 0;
}