Submission #2979996

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,a) for(int i=0;i<(a);i++)
const ll MOD=1000000007;

// 1ターン分プラスして，
// dp_x=1+dp_(x-2)*P/100+dp_x*(100-p)/100
// dp_x=dp_(x-2)+100/p

int main(){
  ll x; cin>>x;
  double p; cin>>p;
  if(x%2) x++;
  cout<<setprecision(15);
  cout<<x/2*100/p<<endl;
  return 0;
}

Submission Info

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