Submission #1766047

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Source Code Expand

#include <iostream>
#include <stdio.h>
#include <string>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <math.h>
#include <vector>
#include <algorithm>
using namespace std;
 
int main(){
	unsigned int x;
	cin >> x;
	unsigned int ans = ceil((sqrt(1 + 8 * x) - 1) / 2);
	cout << ans << endl;
	return 0;
}

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