#include <iostream>
#include <cmath>
using namespace std;
const double PI = acos(-1);
int main()
{
int n;
cin>>n;
if(n==1)cout<<1<<endl;
else
{
cout.precision(9);
cout<<1+1/sin(PI/n)<<endl;
}
return 0;
}
#include <stdio.h>
long N;
int main()
{
scanf("%ld", &N);
printf("%ld %ld %ld\n", N * N + N, N * N + 2 * N, N * N);
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
int N,s[10001];
cin>>N;
s[0] = 0;
for(int i = 0,k; i < N; ++i)
{
cin>>k;
s[i+1] = s[i] + k;
}
int Q,l,r;
cin>>Q;
while(Q--)
{
cin>>l>>r;
cout<<s[r]-s[l-1]<<endl;
}
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
int A,B;
scanf("%d %d",&A,&B);
if(A%2==0) ++A;
if(B%2==0) --B;
printf("%d\n",(B-A)/2+1);
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int a,b,c,d;
double di, Dist;
int main()
{
cin>>a>>b>>c>>d;
if (a*b ==c * d)
{
cout<<"Impossible."<<endl;
return 0;
}
di= a * a + b * b - c * c - d * d;
di /= 2 * (a * b - c * d);
Dist = sqrtl(a * a + b * b - 2 * a * b * di) * 1000;
printf("Distance is %.0lf km.\n",Dist);
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> nums;
int n;
cin>>n;
for (int i = 0; i < n; ++i)
{
int c;
cin>>c;
nums.push_back(-c);
}
sort(nums.begin(), nums.end());
for (int i=0; i<n; i++)
{
cout<<-nums[i]<<endl;
}
return 0;
}
#include<bits/stdc++.h>
using namespace std;
string s="";
int p()
{
s="";
s+='1';
long long i=1;
while(i*10)
{
if(s.size()<=66000)
{
s+=itoa(i);
}
else break;
}
}
int main()
{
p();
int t,n;
cin>>t;
while(t--)
{
cin>>n;
cout<<s[n-1]<<endl;
}
return 0;
}
#include<iostream>
using namespace std;
int main()
{
long long n;
string s;
while(cin>>n>>s)
{
long long sm=1,sz=s.size(),x=n/sz;
// for(long long i=0;i<x;i++)
while(n>1)
{
sm*=n;
n-=sz;
}
cout<<sm<<endl;
}
return 0;
}
#include<bits/stdc++.h>
typedef long long ll;
int main()
{
int a, b, div, mod;
scanf("%d%d", &a, &b);
int sum = a;
while(a>=b)
{
div = (a/b);
sum = sum + div;
mod = (a%b);
a= (div+mod);
}
printf("%d\n", sum);
return 0;
}
#include<bits/stdc++.h>
using namespace std;
int main()
{
//freopen("in.txt","r",stdin);
//freopen("out.txt","w",stdout);
vector<long double> v;
long double n;
while(cin>>n) v.push_back(n);
for(int i=v.size()-1; i>=0; i--) cout<<setprecision(4)<<fixed<<sqrtl(v[i])<<endl;
return 0;
}
