Submission #1167293

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Source Code Expand

/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author yassin
 */

#include <fstream>

#include <iostream>
#include <vector>
#include <string>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <cstdlib>
#include <tuple>
#include <queue>
#include <functional>
#include <stack>
#include <cassert>

using namespace std;

class atC {
public:
    void solve(istream& in, ostream& out) {
        long long X;
        in >> X;
        
        long long cur = 0, i;
        for (i = 1; cur < X; ++i) {
            cur += i;
        }
        
        out << i-1 << "\n";
    }
};


int main() {
	std::ios::sync_with_stdio(false);

	atC solver;
	std::istream& in(std::cin);
	std::ostream& out(std::cout);
	solver.solve(in, out);
	return 0;
}

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