#include <iostream>
#include <fstream>
using namespace std;
ifstream f("farfurii.in");
ofstream g("farfurii.out");
int main()
{
    int n, k;
    f >> n >> k;
    int i = 1;
    while(i*(i-1)/2 < k){
        i++;
    }
    return 0;
}