Submission #122058

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Source Code Expand

#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <climits>
#include <cfloat>
#include <functional>
#include <cctype>

using namespace std;

#define REP(i,n) for(int i = 0; i < (int)n; ++i)

const double EPS = 1e-8;
const double INF = 1e12;

int main()
{
	int N;
	cin >> N;
	double sum = 0;
	for(int i = 1; i <= N; ++i) {
		sum += 10000.0 * i  / N;
	}
	cout << sum << endl;
	return 0;
}

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