Submission #3359374

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)   FOR(i,0,n)
#define INF 1e9

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    double N;
    cin >> N;

    double sum = 0;
    REP(i,N) {
        sum += ((i+1) * 10000 / N);
    }
    cout << int(sum) << endl;
}

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