#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m;
    cin>>m;
    int s=0,n=1;
    while(s<=m)
    {
        s+=n;
        n++;
    }
    n--;
    cout<<n;
    return 0;
}

👎 👎 👎

😄

A AAA