#include <stdio.h>
#include <stdlib.h>
int main()
{
int n,m;
while(scanf("%d%d",&n,&m)!=EOF)
{
int num=0,total=0;
while(1)
{
num++;
total=n+total;
n++;
if(m<total)
{
break;
}
}
printf("%d\n",num);
}
}