#include<stdio.h>
#include<stdlib.h>

void run(void){
  int n;
  double p;
  scanf("%d%lf",&n,&p);

  double *primeProb=(double *)malloc(sizeof(double)*(n+1));
  primeProb[0]=primeProb[1]=0;
  int i;
  for(i=2;i<=n;i++){
    primeProb[i]=1.0;
  }

  for(i=2;i<=n;i++){
    int j;
    for(j=2*i;j<=n;j+=i){
      primeProb[j]*=(1-p);
    }
  }

  double ans=0.0;
  for(i=2;i<=n;i++){
    ans+=primeProb[i];
  }
  printf("%lf\n",ans);
  free(primeProb);
  return;
}

int main(void){
  run();
  return 0;
}