#include <iostream>

using namespace std;

int main (){
    int n, m;
    int sum, counter;
    while( cin >>  n >> m){
    sum = 0;
    counter=0;
    do{
    sum+=n;
    n++;
    counter++;

    //cout<<"n: "<< n << "\nsum "<< sum << "\ncounter "<< counter<<"\n\n";
    }while(sum<=m);

    cout << counter << "\n";
    }

        }