#include <stdio.h>

long int n,m,sum,ans;
int main(){
while(scanf("%d %d",&n,&m)!=EOF){

sum=n;
ans=1;
if(m<n){
printf("1\n");
}else{
while(sum<=m){
ans=ans+1;
n=n+1;
sum=sum+n;
}
printf("%d\n",ans);
}
}
}