#include <bits/stdc++.h>
using namespace std;

signed main(){
  int N; cin >> N;
  double P; cin >> P;
  vector< double > livep( N + 1, 1.0 );
  for( int i = 2; i < N; ++i )
    for( int j = i + i; j <= N; j += i )
      livep[ j ] *= 1.0 - P;
  double ans = 0.0;
  for( int i = 2; i <= N; ++i )
    ans += livep[ i ];
  cout << fixed << setprecision( 8 ) << ans << endl;
  return 0;
}